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## Electricity and Magnetism E

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### Bar magnet. Solenoid. Straight wire. Four ways objects are 'pushed' by ... Will the magnet pivot clockwise or counterclockwise? Electric Motor: Electric Motor: ... – PowerPoint PPT presentation

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Title: Electricity and Magnetism E

1
(No Transcript)
2
Review
3
It looks like a solenoid, it acts like a
solenoid--why?
4
It looks like a solenoid, it acts like a
solenoid--why?
Cross section of magnetized iron
magnetization current
5
It looks like a solenoid, it acts like a
solenoid--why?
Cross section of magnetized iron
But why are they all lined up in the first place?
6
Torque (i.e., twisting force) on a current
carrying loop.
7
Torque (i.e., twisting force) on a current
carrying loop.
8
Torque (i.e., twisting force) on a current
carrying loop.
9
Electro-magnet
• Amplifier of the field due to a current loop.

10
Electro-magnet
• Amplifier of the field due to a current loop.

remove the loop
11
Electro-magnet
• Amplifier of the field due to a current loop.

hard
soft
12
Keeping it all straight...
• Three ways to set up a magnetic field
• Bar magnet
• Solenoid
• Straight wire
• Four ways objects are pushed by a field
• Charge moving in a field
• Current in a field
• Bar magnet (solenoid) in uniform field
• Bar magnet (solenoid) in non-uniform field

13
Why is there a solenoid on your starting motor?
14
Why is there a solenoid on your starting motor?

15
Why is there a solenoid on your starting motor?

16
What is the direction of the force on the right
loop?
17
What is the direction of the force on the right
loop?
18
What is the direction of the force on the right
loop?
N
S
19
TOP VIEW
Will the magnet pivot clockwise or
counterclockwise?
N
S
20
TOP VIEW
Will the magnet pivot clockwise or
counterclockwise?
21
Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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Electric Motor
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(No Transcript)
33
An electron is injected between two charged
plates as shown. The B field is fixed and the
charge on the plates is adjusted until the
electron passes undeflected. Which plate is
positive and which is negative?
-Q
B
e
-Q
What is the net force on the electron?
34
What direction is the magnetic force?
What direction is the electric force?
What direction do the electric field lines point?
Which plate is positive?
35
If the electron slowed down, would the electron
veer high or veer low?
36
If the electron slowed down, would the electron
veer high or veer low?
FB