Download - Electromagnetic induction
![Page 1: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/1.jpg)
Electromagnetic Induction
The interaction between current and magnetic field
![Page 2: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/2.jpg)
Remember from Year 12
• When current flows through a wire a magnetic field is created around the wire
• And if the wire is coiled (to form a solenoid)
The relationship between electricity and magnetism (Motor effect)
Just like;
![Page 3: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/3.jpg)
Magnetic Fields
![Page 4: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/4.jpg)
Remember from Year 12
• When a wire moves through a magnetic field a voltage is induced
• Or a magnetic field moves through a coil a voltage is induced
The relationship between magnetism and electricity (Generator effect)
![Page 5: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/5.jpg)
Using Your Hand and Formulae
)θ(sinBILF
BvLV
)θ(sinBqvF
• Right-hand grip rules• Right –hand slap rule
• Force on a current carrying wire (motor effect)
• Induced voltage (generator effect)
• Force on a charge
![Page 6: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/6.jpg)
The Motor Effect
• A current carrying wire at an angle to a magnetic field experiences a force
• This is as a result of the interaction between the magnetic field and the magnetic field around the wire.
![Page 7: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/7.jpg)
Electric Motors
• Most electric motors use electricity to make magnetism
-the motor effectThe use of electric motors is widespread with most of us using many each day
![Page 8: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/8.jpg)
RH Grip Rule -Wire
![Page 9: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/9.jpg)
RH Grip Rule -Solenoid
![Page 10: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/10.jpg)
RH Grip Rule -SolenoidPredict the direction of the North
magnetic pole
![Page 11: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/11.jpg)
RH Grip Rule -SolenoidPredict the direction of the North
magnetic pole
![Page 12: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/12.jpg)
RH Grip Rule -SolenoidPredict the direction of the North
magnetic pole
![Page 13: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/13.jpg)
RH Grip Rule -SolenoidPredict the direction of the North
magnetic pole
![Page 14: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/14.jpg)
RH Motor Rule Examples
I
I
Predict the direction of the force on the wire and label the positive end of
the wire
![Page 15: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/15.jpg)
RH Motor Rule ExamplesI
I
Predict the direction of the force on the wire and label the positive end of
the wire
![Page 16: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/16.jpg)
RH Motor Rule Examples
I
I
Predict the direction of the force on the wire and label the positive end of
the wire
![Page 17: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/17.jpg)
RH Motor Rule ExamplesPredict the direction of the force on
the wire and label the positive end of the wire
![Page 18: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/18.jpg)
RH Motor Rule ExamplesPredict the direction of the forces
on the wire coil at 1 and 2
![Page 19: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/19.jpg)
Force on a Charge
• A single charge or a charged object will also experience a force as it moves through a magnetic field as it too creates a magnetic field as it moves (just like current in a wire)
![Page 20: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/20.jpg)
Force on a Charge
![Page 21: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/21.jpg)
Slap Rule for Force on a Charge
v
v
![Page 22: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/22.jpg)
Force on a Charge
![Page 24: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/24.jpg)
Force on a ChargePredict the direction of the force on
the moving positive charge
+q
![Page 25: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/25.jpg)
Force on a ChargePredict the direction of the force on
the moving positive charge
+
![Page 26: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/26.jpg)
Force on a ChargePredict the direction of the force on
the moving negative charge
-q
![Page 27: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/27.jpg)
Force on a ChargePredict the direction of the force on
the moving negative charge
-
![Page 28: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/28.jpg)
Force on a Charge –the maths
• Force on moving charges in a wire;
• Force on moving charges on their own;
)θ(sinBILF
)(sinBqvF Where;
F=force (N)B= magnetic field strength
(T)q=charge on the object (C)v=velocity of the charge
(ms-1)=angle from field lines ()
![Page 29: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/29.jpg)
Exercises
1. Find the force on an electron (1.60×10-19C) travelling at 3×107 ms-1 perpendicular to a magnetic field of 0.18T
9×10-13N2. Calculate the charge of a particle travelling
at 340ms-1 perpendicular to a 1.2T magnetic field that experiences a force of 3.5×10-12N
8.6×10-15C
![Page 30: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/30.jpg)
Electricity Generation
• Most generators use magnetism to generate electricity
-The generator effect
![Page 31: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/31.jpg)
Induction -the Generator Effect
• A wire that moves through a magnetic field has a voltage induced across it and therefore a current is induced
• Of course the magnetic field can move past the wire and cause induction also
• Induction is the result of the interaction between the magnetic field and the negatively charged electrons in the wire
![Page 32: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/32.jpg)
RH Generator Rule
•To predict the direction of the induced current use the modified RH slap rule•As with the RH slap rule for the motor effect, the thumb is the cause (the velocity of the wire for a generator), the fingers are the field lines, and the “slap” is the direction of the resultant (in this case the current)
v
B
I
![Page 33: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/33.jpg)
RH Generator Rule Examples
v
Predict the direction of the current and label the +ve end of the wire
![Page 34: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/34.jpg)
RH Generator Rule Examples
v
v
Predict the direction of the current and label the +ve end of the wire
![Page 35: Electromagnetic induction](https://reader035.vdocuments.site/reader035/viewer/2022062319/55896effd8b42a0f078b45e9/html5/thumbnails/35.jpg)
vv
RH Generator Rule ExamplesPredict the direction of the current and label the +ve end of the wire