The Motor Effect and Electric Motors

Question 1

What happens when a current carrying wire is placed between to magnetic poles?

Answer 1

The magnetic field around the wire interacts with the magnetic field it has been placed in.

Question 2

What is the Motor Effect?

Answer 2

When the magnet and conductor exert a force on each other and can cause the wire to move

Question 3

What angle does the wire have to be at to experience full force?

Answer 3

• 90 to the magnetic field

- If it runs parallel it will experience NO force

Question 4

How does the force always act?

Answer 4

At right angles to the magnetic field of the magnets and to the direction of the current in the wire

Question 5

What happens to the strength of the magnetic field when the magnitude increases?

Answer 5

It increases

Question 6

When also does the force increase?

Answer 6

When the amount of current passing through the conductor is increased

Question 7

What are the 3 things that affect the force acting on a conductor in a magnetic field?

Answer 7

• Magnetic Flux Density - how many field lines there are
  in a region.
• Size of the current through the conductor
• The length of the conductor that is in the magnetic
  field

Question 8

When the current is at 90 degrees to the magnetic field it is in and the force acting on it can be found using which equation?

Answer 8

F = BIL

Force = Magnetic Flux Density x Current x Lenght

Question 9

How does Flemmings left-hand rule work?

Answer 9

Use left hand

1) Point the First finger in the direction of the Field
2) seCond finger in the direction of Current
3) thuMb in the direction of force (Motion)