Section 6 Magnets

Question 1

What is a soft magnet?

Answer 1

An object that loses its magnetism quickly

Question 2

What is a hard magnet?

Answer 2

An object that retains its magnetism permanently

Question 3

Example of a soft magnetic material

Answer 3

Iron

Question 4

Example of a hard magnetic material

Answer 4

Steel

Question 5

What is the motor effect?

Answer 5

When a current-carrying wire is placed in a magnetic field and feels a force, causing the wire to move (motion)

Main principle of electric motors

Question 6

What is Fleming’s Left Hand Rule?

Answer 6

• ThuMb = Motion
• First finger = Field
• seCond finger = Current

Question 7

What is electromagnetic induction?
(the dynamo effect)

Answer 7

The creation of a voltage (potential difference) in a wire when it experiences a change in magnetic field. This can happen if the wire moves through a magnetic field or if the magnetic field around the wire changes.

Question 8

How to increase voltage in the dynamo effect?

Answer 8

• Increase the magnetic strength
• Increase the number of coil turns
• Increase speed of movement

Question 9

What is the use of a transformer?

Answer 9

To increase or decrease voltage in electricity transmission