Electromagnetism

Question 1

Describe electromagnetic induction

Answer 1

A conductor moving across a magnetic field can induce an EMF in the conduction

Question 2

How does one increase the effect of electromagnetic conduction?

Answer 2

Moving the wire faster
Using a strong magnet
Increasing the length of wire in the magnetic field

Question 3

What are the 3 factors of electromagnetism?

Answer 3

Motion
Current
Magnetic field

Question 4

Describe the right hand ampere rule.

Answer 4

The curl of the fingers indicates the direction of the magnetic field.
The thumb represents the current direction.

Question 5

Describe the right hand solenoid rule.

Answer 5

The curl of fingers follow the current.
Thumb indicates direction of the magnetic field

Question 6

Describe Faraday’s right hand generator rule.

Answer 6

Middle finger represents current
Index finger represents magnetic field (N to S)
Thumb represents the motion

Question 7

Describe Lenz’s law.

Answer 7

An induced current always flows in a direction such that it opposes the change which produced it.

Question 8

Describe a slip ring commutator.

Answer 8

Produces A.C current in a generator

Question 9

Describe a split ring commutator.

Answer 9

Produces D.C current in a generator

Question 10

What does a motor do?

Answer 10

Converts electrical energy into kinetic energy

Question 11

Describe Flemming’s left hand motor rule.

Answer 11

Thumb represents motion
Index finger represents magnetic field
Middle finger represents current