The motor effect

?
  • Created by: Char
  • Created on: 21-05-13 20:09
What force may the wire carrying an electric current placed in a magnetic field?
The motor effect
1 of 16
When is this force the maximum?
If the wire is at an angle of 90 degrees to the magnetic field
2 of 16
When is it zero?
If the wire is parallel to the magnetic field
3 of 16
What is Fleming's left hand rule used to determine?
The direction of the force
4 of 16
What does the thumb represent?
The direction of the force
5 of 16
What does the first finger represent?
The magnetic field (pointing from North to South)
6 of 16
And the second finger?
Represents the current (pointing positive to negative)
7 of 16
How many things can the size of force be increased by?
2
8 of 16
The first one?
Increasing the strength of the magnetic field
9 of 16
And the second one?
Increasing the size of the current
10 of 16
The direction of the force on the wire is reversed if?
Either the direction of the current OR the direction of the magnetic field is reversed
11 of 16
Is the motor effect used in different appliances?
Yes
12 of 16
For example...
In an electric motor
13 of 16
Why does the coil spin when the current passes through the coil?
A force acts on each side of the coil due to the motor effect AND the force on each side of the coil is in the opposite direction to the force on the other side
14 of 16
What does the 'split-ring' commutator reverse?
The direction of the current around the coil every half-turn
15 of 16
Why is the coil always pushed in the same direction?
Because the sides swap over each other every half turn
16 of 16

Other cards in this set

Card 2

Front

When is this force the maximum?

Back

If the wire is at an angle of 90 degrees to the magnetic field

Card 3

Front

When is it zero?

Back

Preview of the front of card 3

Card 4

Front

What is Fleming's left hand rule used to determine?

Back

Preview of the front of card 4

Card 5

Front

What does the thumb represent?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Forces and Motion resources »