(6) Electric motors and electromagnetic induction

Question 1

What happens to a charged particle when it moves through a magnetic field?

Answer 1

It experiences a force, so long as it’s movement isn’t parallel to the magnetic field.

Question 2

How does placing a current carrying wire in a magnetic field exert a force on it?

Answer 2

The two magnetic fields overlap, causing there to be an area of stronger magnetic forces underneath the wire and weaker forces above the wire. This causes an upward movement of the wire.

Question 3

How can we increase the size of the force?

Answer 3

• By increasing the strength of the magnetic field

- By increasing the current.

Question 4

What does Fleming’s left hand rule show?

Answer 4

The thumb gives the direction of force, the pointer give the direction of the field, and the middle finger gives the direction of the current.

Question 5

What is electromagnetic induction?

Answer 5

The use of a changing magnetic field to produce a current or voltage.

Question 6

How can we increase the size of the induced voltage?

Answer 6

• By moving the magnet more quickly.
• By using a stronger magnet.
• By using a coil with more turns.

Question 7

What is a transformer?

Answer 7

It is an electrical device that can change the size of an alternating voltage by having different numbers of coils on the input and output sides.