devil physics the baddest class on campus ib physics...
TRANSCRIPT
![Page 1: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/1.jpg)
DEVIL PHYSICS THE BADDEST CLASS ON CAMPUS
IB PHYSICS
![Page 2: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/2.jpg)
TSOKOS LESSON 5-6 MAGNETIC FIELDS
![Page 3: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/3.jpg)
IB Assessment Statements
Topic 6-3, Magnetic Force and Field
6.3.1. State that moving charges give rise to magnetic fields.
6.3.2. Draw magnetic field patterns due to currents.
6.3.3. Determine the direction of the force on a current-carrying conductor in a magnetic field.
![Page 4: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/4.jpg)
IB Assessment Statements
Topic 6-3, Magnetic Force and Field
6.3.4. Determine the direction of the force on a charge moving in an electric field.
6.3.5. Define the magnetic field and direction of a magnetic field.
6.3.6. Solve problems involving magnetic forces, fields, and currents.
![Page 5: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/5.jpg)
Objectives
Understand the meaning of magnetic field and find its magnitude and direction in simple situations involving straightline conductors
and solenoids
using the right-hand rule
where appropriate
r
IB
2
0
L
NIB 0
![Page 6: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/6.jpg)
Objectives
Find the force on moving charges
and currents,
in magnetic fields and appreciate the definition of the ampere as a fundamental SI unit, using the right-hand rule for forces where appropriate.
sinqvBF
sinBILF
![Page 8: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/8.jpg)
Electric Field, Magnetic Field
A charge will generate an electric field around itself
Any other charge (small positive test charge) that enters the field will experience a force on it = electric force
![Page 9: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/9.jpg)
Electric Field, Magnetic Field
Same is true for a magnet or an electric current (moving charge)
Each of these produce a magnetic field around them
When another magnet or electric current enters the magnetic field, it will experience a force on it
Direction of magnetic field is determined by relation to magnetic field of the earth
![Page 10: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/10.jpg)
Electric Field, Magnetic Field
![Page 11: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/11.jpg)
Electric Field, Magnetic Field
![Page 12: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/12.jpg)
Magnetic Fields
Magnetic fields are produced by permanent
magnets and by electric currents
![Page 13: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/13.jpg)
Magnetic Field from Coil
![Page 14: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/14.jpg)
Magnetic Field from Solenoid
![Page 15: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/15.jpg)
Magnetic Field from a Loop of Wire
![Page 16: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/16.jpg)
Magnetic Field from a Loop of Wire
![Page 17: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/17.jpg)
Magnetic Field from a Straight Wire
![Page 18: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/18.jpg)
Electric Field, Magnetic Field
Magnets and electric currents (moving charges) produce magnetic fields around them
When another magnet or electric current enters the magnetic field, it will experience a force on it
![Page 19: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/19.jpg)
Force on a Current
![Page 20: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/20.jpg)
Force on a Current
![Page 21: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/21.jpg)
Force on a Current
Using the right hand place the thumb in the direction of the current and the fingers in the direction of the magnetic field. The direction away from the palm is the direction of the resulting force.
![Page 22: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/22.jpg)
Force on a Current
Current
Field
Force
Thumb
Fingers
Palm
![Page 23: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/23.jpg)
Force on a Length of Wire
Θ is the angle between the current and the direction of the magnetic field
sinBILF
![Page 24: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/24.jpg)
Force on a Length of Wire
Θ is the angle between the current and the direction of the magnetic field
sinBILF
I
B
θ
![Page 25: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/25.jpg)
Magnetic Force on a Moving Charge
sinBILF
t
qI
tvL
sin
sin
qvBF
tvt
qBF
![Page 26: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/26.jpg)
Magnetic Force on a Moving Charge
sinqvBF
![Page 27: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/27.jpg)
Magnetic Force on a Moving Charge
![Page 28: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/28.jpg)
Work Done by Magnetic Force
None
Since the magnetic force is always perpendicular to the velocity, it cannot do work
Magnets in particle accelerators merely deflect or direct particles
Electric fields are used to increase the particle’s kinetic energy
![Page 29: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/29.jpg)
Orsted’s Discovery
The magnitude of the magnetic field B created by the current in a wire varies linearly with the current in the wire and inversely with the perpendicular distance from the wire.
r
IB
2
0
![Page 30: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/30.jpg)
What does that remind you of?
![Page 31: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/31.jpg)
What does that remind you of?
r
IB
2
0r
QE
04
1
![Page 32: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/32.jpg)
Orsted’s Discovery
r
IB
2
0
![Page 33: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/33.jpg)
Orsted’s Discovery
r
IB
2
0
µ0 is the magnetic permeability of a vacuum
(ε0 is the electric permittivity of a vacuum)
27
0 104 ANx
![Page 34: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/34.jpg)
Orsted’s Discovery
r
IB
2
0
Unit for the magnetic field is the tesla (T)
Magnetic field of the earth at the surface is 10-4 T
A high voltage transmission line carrying a 2000 A current produces a magnetic field of 8x10-5 T
![Page 35: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/35.jpg)
Direction of the Magnetic Field
![Page 36: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/36.jpg)
Direction of the Magnetic Field
![Page 37: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/37.jpg)
Strength of the Magnetic Field
![Page 38: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/38.jpg)
Field Strength from Single Wire Loop
r
IB
2
0
![Page 39: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/39.jpg)
Field Strength from a Solenoid
L
NIB 0
![Page 40: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/40.jpg)
Field Strength Between Two Current-Carrying Wires
![Page 41: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/41.jpg)
Field Strength Between Two Current-Carrying Wires
![Page 42: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/42.jpg)
Field Strength Between Two Current-Carrying Wires
r
IB
2
0sinBILF
LIr
IF
LIBF
120
1
121
2
LIr
IF
LIBF
210
2
212
2
![Page 43: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/43.jpg)
Field Strength Between Two Current-Carrying Wires
The force on each wire will be the same, even though the magnetic fields produced by each wire individually is different
r
IILF
LIr
IF
1201
120
1
2
2
r
qqkF 21
r
mmGF 21
![Page 44: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/44.jpg)
Fun Facts:
The Ampere is defined through the magnetic force between two parallel wires. If the force on a 1m length of two wires that are 1m apart and carrying equal currents is 2x10-7 N, then the current in each wire is defined to be 1 A.
![Page 45: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/45.jpg)
Fun Facts:
The coulomb is defined in terms of the ampere as the amount of charge that flows past a certain point in a wire when a current of 1 A flows for 1 second.
![Page 46: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/46.jpg)
Summary: Are you able to
Understand the meaning of magnetic field and find its magnitude and direction in simple situations involving straightline conductors
and solenoids
using the right-hand rule
where appropriate
r
IB
2
0
L
NIB 0
![Page 47: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/47.jpg)
Summary: Are you able to
Find the force on moving charges
and currents,
in magnetic fields and appreciate the definition of the ampere as a fundamental SI unit, using the right-hand rule for forces where appropriate.
sinqvBF
sinBILF
![Page 48: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/48.jpg)
QUESTIONS?
![Page 49: Devil physics The baddest class on campus IB Physics ...sphsdevilphysics.weebly.com/uploads/5/0/7/1/5071691/tsokos_lsn_5-6_lecture.pdf6.3.1. State that moving charges give rise to](https://reader033.vdocuments.site/reader033/viewer/2022051905/5ff70c281faa083d352c4de2/html5/thumbnails/49.jpg)
Homework
SL: #1-20, 23, 25-27, 30-32
HL: #1-32, skip 21, 22, 24, 28, 29