Electromagnets and motors test questions - Other

1

Which of these makes an electromagnet stronger?

2

What controls a relay?

3

What happens to the magnetic field around an electromagnet when the current is reversed?

4

Which of these induces a bigger voltage in electromagnetic induction?

5

What do field line patterns show?

6

What causes the motor effect?

7

What is the purpose of a commutator?

8

What do speakers contain?

9

What does your first finger point to in the left hand rule?

10

What advantage does an electromagnet have over a magnet?