lab manual of physics laboratory for engineers
TRANSCRIPT
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NL-110 Physics Laboratory for Engineers
Lab Manual (Work Book)
DEPARTMENT OF ELECTRICAL ENGINEERING,
FAST-NU, LAHORE
Name: ___________________ Roll No.:_________________
Section: __________________ Group: __________________
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Table of Contents
Sr.
No.
Description
Marks
2.
Experiment No.1: To discover the relationship of centripetal force with
mass, velocity and radial distance to study simple harmonic motion as
circular motion /10
3. Experiment No.2: To find the coefficient of static friction and the
coefficient of kinetic friction for different surfaces. /10
4. Experiment No.3: To find out rotational inertia of a ring and a disk. /10
5. Experiment No.4: To find the spring constant for several springs /10
6. Experiment No.5: To calculate the period of oscillation measured from a
plot of angular displacement versus time from torsional pendulum. /10
7. Experiment No.6: To explore dependence of period of a simple
pendulum on acceleration due to gravity. /10
8. Experiment No.7: To find the ratio of Specific Heats of a Gas /10
9.
Experiment No.8: To verify the inverse-square relationship of
Coulombโs law and find the value of Coulomb's constant from Coulomb
torsional balance. /10
10. Experiment No.9: To calculate the charge on an electron with Millikan's
oil drop experiment /10
11.
Experiment No.10: Determine the role of resistors and capacitors in
electronic circuits, verify Ohmโs law and calculate time-constant of a
capacitor /10
12. Experiment No.11: To calculate the equivalent capacitance in series and
in parallel combination of capacitors /10
13.
Experiment No.12: To investigate the magnetic force of a current
carrying wire by the effect of current, length of conductor, magnetic
field and angle on the magnetic force. /10
14. Experiment No.13: To calculate induced e.m.f in a circuit by Faradayโs
law of induction. /10
15. Experiment No.14: To plot the magnetic fields of different coils (single,
double, solenoid) versus position. /10
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Name: ____________________ Roll No.:______________ Section: _______
EXPERIMENT # 1:
Centripetal Force
EXPERIMENT 1A โ FORCE VS. MASS (Radius and Velocity Must be
Constant)
Force (N) Mass (kg)
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Paste the Force VS. Mass Graph below:
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Exp. Slop for F/m = ______________
Cal. Slop for F/m:
๐ญ
๐=
๐^๐
๐
Calculate %error = |๐ฌ๐๐.๐บ๐๐๐๐โ๐ช๐๐.๐บ๐๐๐๐
๐๐๐ฅ.๐๐ฅ๐จ๐ฉ๐| ร ๐๐๐
EXPERIMENT 1B โ FORCE VS. VELOCITY (Radius and Mass
Must be Constant)
Force (N) Velocity (m/s) Velocity(m^/s^2)
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Paste the Force VS. Velocity squared graph below:
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Exp. Slope for F/v^2 = ______________
Cal. Slope for F/v^2:
๐ญ
๐^๐=
๐
๐
Calculate %error = |๐ฌ๐๐.๐บ๐๐๐๐โ๐ช๐๐.๐บ๐๐๐๐
๐๐๐ฅ.๐๐ฅ๐จ๐ฉ๐| ร ๐๐๐
EXPERIMENT 1C โ FORCE VS. RADIUS (Mass and Velocity
Must be Constant)
Force (N) Radius (m) 1/Radius (1/m)
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Paste the Force VS. 1/Radius graph below:
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Exp. Slope for Fr = ______________
Cal. Slope for Fr:
๐ญ๐ = ๐๐^๐
Calculate % error= |๐ฌ๐๐.๐บ๐๐๐๐โ๐ช๐๐.๐บ๐๐๐๐
๐๐๐ฅ.๐๐ฅ๐จ๐ฉ๐| ร ๐๐๐
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FINAL ANALYSIS:
1. Using words and a mathematical expression, describe the relationship
between force and mass in uniform circular motion.
2. Using words and a mathematical expression, describe the relationship
between force and velocity in uniform circular motion.
3. Using words and a mathematical expression, describe the relationship
between force and radius in uniform circular motion.
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4. Combine the three relationships above to create one relationship for force,
mass, velocity, and radius.
5. How would you convert this expression into an equation?
6. What is the constant of proportionality for this equation? Explain.
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7. How could such an equation be used?
8. The figure above is an overhead view of the rotating mass. For each of the
4 points, draw the direction and relative magnitude of the force.
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 2:
To find the coefficient of static friction and the coefficient of
kinetic friction for different surfaces
Carpeted tray:
Exp. Slope for static friction = ______________
Exp. Slope for kinetic friction = _______________
Cal. Slope static friction:
ยตs=๐ญ๐
๐ต
Force (N) Static
friction (N)
Force (N) Kinetic
friction (N)
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Exp. slope for kinetic friction:
ยตk =๐ญ๐
๐ต
Calculate % error= |๐ฌ๐๐.๐บ๐๐๐๐โ๐ช๐๐.๐บ๐๐๐๐
๐๐๐ฅ.๐๐ฅ๐จ๐ฉ๐| ร ๐๐๐
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Paste Force VS. Time and Friction VS. Normal graph below:
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Wooden tray:
Exp. Slope for static friction = ______________
Exp. Slope for kinetic friction = ______________
Cal. Slope static friction:
ยตs=๐ญ๐
๐ต
Force (N) Static
friction (N)
Force (N) Kinetic
friction(N)
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Exp. slope for kinetic friction:
ยตk =๐ญ๐
๐ต
Calculate % error= |๐ฌ๐๐.๐บ๐๐๐๐โ๐ช๐๐.๐บ๐๐๐๐
๐๐๐ฅ.๐๐ฅ๐จ๐ฉ๐| ร ๐๐๐
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Paste Force VS. Time and Friction VS. Normal graph below:
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Plastic tray:
Exp. Slope for static friction = ______________
Exp. Slope for kinetic friction = ______________
Cal. Slope static friction:
ยตs=๐ญ๐
๐ต
Force (N) Static
friction (N)
Force (N) Kinetic
friction(N)
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Exp. slope for kinetic friction:
ยตk =๐ญ๐
๐ต
Calculate % error= |๐ฌ๐๐.๐บ๐๐๐๐โ๐ช๐๐.๐บ๐๐๐๐
๐๐๐ฅ.๐๐ฅ๐จ๐ฉ๐| ร ๐๐๐
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Paste Force VS. Time and Friction VS. Normal graph below:
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QUESTIONS:
1. What specific equation describes this relationship? (Include numbers and units
for both the slope and vertical intercept)
2. What is the physical meaning of the slope for the static frictional force vs. normal
force graph?
3. What is the physical meaning of the vertical intercept for the static frictional
force vs. normal force graph?
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4. What relationship exists between the kinetic frictional force and the normal force
on an object?
5. What specific equation describes this relationship? (Include numbers and units
for both the slope and vertical intercept)
6. What is the physical meaning of the slope for the kinetic frictional force vs.
normal force graph?
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7. What is the physical meaning of the vertical intercept for the kinetic frictional
force vs. normal force graph?
8. Did the normal force on the friction tray affect either the coefficient of static
friction or the coefficient of kinetic friction? Explain.
9. Rank the friction trays from highest coefficients of friction to lowest. What is
physically different with the surfaces with high coefficients versus the surfaces
with low coefficients? Explain.
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 3:
To find out rotational inertia of a ring and a disk
Paste the Angular velocity VS. Time graph below:
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CALCULATIONS:
I (1)
๐=rT (2)
maFmgF (3)
1. Derive equation (4), (5) and (6) using equation (1), (2) and (3) to calculate the
experimental value of the rotational inertia of the ring, disk, and Rotary Motion
Sensor together.
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I1=(rpmg) /ฮฑ1โmrp2 (4)
I2=(rp mg)/ฮฑ2โmrp2 (5)
I3=(rpmg)/ฮฑ3โmrp2 (6)
2. Calculate the experimental value of the rotational inertia of the disk and Rotary
Motion Sensor together using Equations (1), (2), and (3).
3. Calculate the experimental value of the rotational inertia of the Rotary Motion
Sensor alone using Equations (1), (2), and (3).
(Radius)pulley = _________m
(Mass)disc = g
(Diameter)disc = _______mm
(Radius)disc = m
(Mass)ring = g
(Internal diameter)ring= m
(External diameter)ring= m
(Internal radius)ring = m
(External radius)ring = m
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Use following equations to find the rotational inertia of Ring
and disc:
2
2
2
12
1RRMI
2
2
1MRI
(I)ring =
(I)disc =
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Calculate the experimental value of the rotational inertia of the rotary motion
sensors & disc Exp. Slope = ฮฑ1 (D+R+P) = _____________
Exp. Slope = ฮฑ2 (D+P) = _____________
Exp. Slope = ฮฑ3 (P) = _____________
4. Subtract the rotational inertia of the Rotary Motion Sensor from the rotational
inertia of combination of the disk and Rotary Motion Sensor. This will be the
rotational inertia of the disk alone.
5. Subtract the rotational inertia of the combination of the disk and Rotary Motion
Sensor from the rotational inertia of combination of the ring, disk, and Rotary
Motion Sensor. This will be the rotational inertia of the ring alone.
I1=(rpmg) /ฮฑ1โmrp2=
I2=(rp mg)/ฮฑ2โmrp2=
I3=(rpmg)/ฮฑ3โmrp2=
6. Calculate the experimental values of the rotational inertia of the ring and disk.
Rotational Inertia of ring=I1 โI2=
Rotational Inertia of Disc=I2-I3=__________________
7. Use percent differences to compare the experimental values to the theoretical
values.
100% xlTheoretica
lTheoreticaalExperimentdifference
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%age error for ring=
%age error for disc=
FINALANALYSIS: (Post-Lab Questions)
1) Write conclusion of the experiment.
2) Name the sensors used in the experiment. And also write the function and
characteristics of the sensors.
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Name: ____________________ Roll No.:______________ Section: _______
Experiment # 4:
To find the spring constant for several springs
Dull spring
Longest spring
Force (N) Extension (m)
Force (N) Extension (m)
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Paste Force VS. Extension graph for dull and longest spring below:
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CALCULATIONS/QUESTIONS
1. In general, what pattern do you notice between the force and the
displacement/extension of the spring?
2. Starting with y = mx + b, write an equation that represents the relationship
between force and displacement. Don't forget to include units on all numbers!
3. What is the physical meaning of the slope for the force-displacement graph?
(Hint: Look at the units!)
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4. What is the physical meaning of the vertical intercept for the force-displacement
graph?
5. If you hung the "LONGEST" spring from the ceiling and placed a 50 g mass on
it, how far would it extend?
6. Some springs are considered non-Hookian. Explain what this term means.
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 5:
To calculate the period of oscillation is measured from a plot
of the angular displacement versus time from a torsional
pendulum
Paste the Torque VS. Angle graph below:
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Paste the Angle VS. Time graph below:
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Calculations:
Exp. Slope = _______________
Cal. Slope:
Slop for kappa ฤธ = __________
Find calculated time period using following equation:
T= 2ฯ โ๐
ฤธ
Where I is given by:
I=๐
๐๐ด๐น^๐
Calculate %error= |๐ฌ๐๐๐๐๐๐๐๐๐๐๐โ๐ช๐๐๐๐๐๐๐๐๐
๐๐๐ฅ๐๐ฎ๐ฅ๐๐ญ๐๐| ร ๐๐๐
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QUESTIONS:
1. How does the period depend on the rotational inertia of the object?
2. Was there any other source of rotational inertia that was ignored in this
experiment?
3. How could you use a torsional pendulum to determine the rotational inertia of
any object that could be mounted on the Rotary Motion Sensor?
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT# 6:
To explore the dependence of the period of a simple
pendulum on the acceleration due to gravity
Angle (deg) Period (s)
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Paste the Angle VS. period graph below:
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QUESTIONS
1. How does the period depend on the acceleration due to gravity?
2. What do the constants in the curve fit for the Period vs. g data represent?
Calculate what they should be theoretically and compare the theoretical
value to the curve fit constants.
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3. Would the pendulum be longer or shorter on the Moon?
4. What would the period be if the pendulum had been inclined to 90
degrees? What value of g does this correspond to?
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 7
Ratio of Specific Heats of a Gas
Height (m) Period (s)
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Paste the pressure VS. Time graph below:
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Calculate ฮณ
ฮณ =๐๐ ^๐๐(๐๐๐๐๐)
๐จ๐ท
Where
m= mass of piston= _________
A= cross-sectional area of piston =__________
P= atmospheric pressure =____________
Slope from graph of h vs. T2 =_________
(ฮณ)exp=
(ฮณ)cal.=
Calculate %error= |๐ฌ๐๐๐๐๐๐๐๐๐๐๐โ๐ช๐๐๐๐๐๐๐๐๐
๐๐๐ฅ๐๐ฎ๐ฅ๐๐ญ๐๐| ร ๐๐๐
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QUESTIONS
1. What is the ratio of specific heats of a diatomic gas in theory? Why?
2. What is the ratio of specific heats of a monatomic gas in theory? Why?
3. Would the slope of the graph for Helium be greater or less than the slope
for air?
4. Why can we assume air is diatomic? What are the main components of
air?
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 8 To verify the inverse-square relationship of Coulombโs law and find
the value of Coulomb's constant from Coulomb torsional balance
Part A FORCE VS. DISTANCE:
Distance (m) Twist Angle (Degrees) 1/D^2 (1/m^2) Twist Angle (Degrees)
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Paste Twist Angle VS. Distance graph and Twist angle vs. 1/D^2 graph below:
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ANALYSIS
1. Calculate the inverse square of the distance values and enter them into the Data Table
"Twist Angle vs 1/(R^2)." Observe the resulting graph. Note: DataStudio automatically
corrects the data to resemble two point charges instead of two spheres.
2. Determine the functional relationship between force (which is proportional to the torsion
angle (ฮธ) and the distance (R).
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Part B FORCE VS. DISTANCE
Voltage (kV) Twist angle (Degrees)
Paste Twist angle vs. voltage graph below:
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ANALYSIS
1. Determine the functional relationship between force (which is proportional to the torsion
angle (ฮธ) and the charge (q) (which is proportional to the Voltage).
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Part C THE COULOMB CONSTANT
Twist angle (Degrees) Mass (mg) Angle (Degrees) Weight (N)
Paste Mass vs. Twist angle graph below:
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Paste weight vs. twist angle graph below:
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CALCULATIONS:
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 9
To calculate the charge on an electron with Millikan's oil
drop experiment.
Voltage (V) ฮT(s)
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Paste the graph below:
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QUESTIONS
1. Compare your value to the accepted value of the charge of an electron:
1.60 X 10-19 C
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 10
Determine the role of resistors and capacitors in electronic circuits, verify
Ohmโs law and calculate time-constant of a capacitor
PART A: CHARGING AND DISCHARGING THE CAPACITOR
Draw schematic diagram below:
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Paste the graph below:
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POST LAB QUESTIONS
1. Describe the changes in voltage from the moment the switch is closed until
the capacitor is โcharged.โ
2. Describe the changes in current from the moment the switch is closed until
the capacitor is โcharged.โ
3. Describe how your observations of the light bulb correspond to your
explanations in questions 1 and 2.
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4. Make a diagram of the circuit as it is charging. Include the direction of
charge flow. Represent positive charges with a โ+.โ Represent negative
charges with a โ-.โ
5. Describe the changes in voltage from the moment after the capacitor is
discharged until the voltage is constant.
6. Describe the changes in current from the moment after the capacitor is
discharged until the current is constant.
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7. Describe how your observations of the light bulb correspond to your
explanations in questions 5 and 6.
8. Make a diagram of the circuit as it is discharging. Include the direction of
charge flow. Represent positive charges with a โ+.โ Represent negative
charges with a โ-.โ
9. Based on the conclusions from the previous questions, what is/are the role(s)
of a capacitor in an electronic circuit?
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PART B: OHM'S LAW
Draw schematic diagram below:
Write values of slope of your graph for 10 ฮฉ, 33 ฮฉ resistors and bulb:
Slope for 10 ฮฉ = _________
Slope for 33 ฮฉ = _________
Slope for bulb = _________
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Paste the graph below:
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POST LAB QUESTIONS
1. What is the function of the capacitor in this part of the experiment?
2. How could this experiment be performed with batteries instead of a
capacitor?
3. Make a diagram of the circuit . Include the direction of charge flow.
Represent positive charges with a โ+.โ Represent negative charges with a โ-
.โ
4. What is the physical meaning of the slope for the Voltage vs. Current
graphs?
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5. What is the physical meaning of the vertical intercept for the Voltage vs.
Current graphs?
6. Starting with y = mx + b, write an equation that represents the relationship
between Voltage vs. Current for the resistors. Don't forget to include units
on all numbers.
7. Why is the voltage-current relationship different for a light bulb vs. a
resistor?
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PART C: TIME CONSTANT
Draw schematic diagram below:
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Paste the graph below:
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CONCLUSIONS/QUESTIONS
1. What is the physical meaning of the "Scale Factor" (A) from the Natural
Exponent Fit?
2. What is the physical meaning of the "Exponent" (C) from the Natural
Exponent Fit?
3. Refer to the diagram of the circuit. Describe the role of the capacitor.
Specifically, discuss the voltage across the capacitor while the capacitor is
charging.
4. Further, discuss the current through the circuit while the capacitor is
charging.
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 11
To calculate the equivalent capacitance in Series Combination
Circuits and Parallel Combination Circuits
Post Lab Questions:
Q1) Calculate the combined capacitance in micro-Farads (ยตF) of the following
capacitors when they are connected together in a parallel combination:
a) two capacitors each with a capacitance of 47nF
b) one capacitor of 470nF connected in parallel to a capacitor of 1ยตF
Q2) You have two 42ฮผF and one 39ฮผF all wired in parallel. Draw the schematic
and calculate the total capacitance of the system.
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Q3) Calculate the total capacitance of the following circuit:
a) when C1= 5ยตF, C2= 15ยตF, C3= 2.1uF, C4= 0.1ยตF
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 12
To investigate the magnetic force of a current carrying wire
by the effect of current, length of conductor and magnetic
field on the magnetic force
Part a FORCE VS. CURRENT
Number of Magnets Used:
Current Loop Used:
TABLE 1: Calculation of Force
Current โMassโ โForceโ
(A) (grams) (grams)
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Slope of Force vs. current graph = ___________
Paste the Force vs. current graph below:
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QUESTIONS:
1. What relationship exists between the magnetic force and current through the
conductor?
2. What is the physical meaning of the slope of the Force vs. Current graph?
3. What is the physical meaning of the vertical intercept of the Force vs. Current
graph?
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4. Can the vertical intercept be attributed to measurement error? Explain.
5. Write a proportionality expression that represents the relationship between
Magnetic Force and Current.
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Part B FORCE VS. LENGTH OF WIRE
# Of magnets used: _______
Current used: __________
โMassโ with I = 0: __________
Length (cm) Mass (grams) Force (grams)
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Slope of Force vs. length graph = ___________
Paste the Force vs. Length graph below:
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QUESTIONS:
1. What relationship exists between the magnetic force and length of
conductor in the magnetic field?
2. What is the physical meaning of the slope of the Force vs. Length
graph?
3. What is the physical meaning of the vertical intercept of the Force
vs. Length graph?
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4. Can the vertical intercept be attributed to measurement error?
Explain.
5. Write a proportionality expression that represents the relationship
between Magnetic Force and Length.
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Part C FORCE VS. MAGNETIC FIELD
Current used: __________
Current loop used: __________
Magnetic field (# of
magnets)
โMassโ I=0 (grams) โMassโ I>0 (grams)
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Slope of Force vs. magnetic field graph = ___________
Paste the Force vs. Magnetic field graph below:
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QUESTIONS:
1. What relationship exists between the Magnetic Force and Magnetic
Field?
2. What is the physical meaning of the slope of the Force vs. Magnetic Field
graph?
3. What is the physical meaning of the vertical intercept of the Force vs.
Magnetic Field graph?
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4. Can the vertical intercept be attributed to measurement error? Explain.
5. Write a proportionality expression that represents the relationship
between Magnetic Force and Magnetic Field.
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 13
To calculate induced e.m.f in a circuit by Faradayโs law of
induction. Paste voltage vs. time graph below:
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Exp. value of E = ___________
Cal. Value of E:
E= -NA โ๐ฉ
โ๐
Where N= No. of turns of Induction wand = 200 D = Diameter of induction wand = 3.1cm = 0.031 m A= Area of induction wand = ------------ โB = Magnetic field =-------------- โt = Change in time period = -------------
Calculate %error= |๐ฌ๐๐๐๐๐๐๐๐๐๐๐โ๐ช๐๐๐๐๐๐๐๐๐
๐๐๐ฅ๐๐ฎ๐ฅ๐๐ญ๐๐| ร ๐๐๐
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ANALYSIS
1. Calculate the value of the average emf using Equation (2). Compare this
value to the value measured from the graph.
2. Identify on the graph where the coil is entering the magnet and where the
coil is leaving the magnet.
3. Is the emf of the first peak positive or negative? Taking into account the
direction the wire is wrapped around the coil, does the sign of the emf
correspond to the direction expected using Lenz's Law?
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4. Why is the sign of the emf of the second peak opposite to the sign of the
first peak?
5. Why is the emf zero when the coil is passing through the exact center of
the magnet?
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Name:____________________ Roll No.:______________ Section:_______
EXPERIMENT # 14
Magnetic Fields of Coils
SINGLE COIL:
Paste the graph for single coil below:
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Calculate %error= |๐ฌ๐๐๐๐๐๐๐๐๐๐๐โ๐ช๐๐๐๐๐๐๐๐๐
๐๐๐ฅ๐๐ฎ๐ฅ๐๐ญ๐๐| ร ๐๐๐
CONCLUSION:
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HELMHOLTZ COILS:
Paste the Helmholtz graph below:
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Calculate %error= |๐ฌ๐๐๐๐๐๐๐๐๐๐๐โ๐ช๐๐๐๐๐๐๐๐๐
๐๐๐ฅ๐๐ฎ๐ฅ๐๐ญ๐๐| ร ๐๐๐
Conclusion: