Uses of magnetism - Higher - OCR Gateway test questions - OCR Gateway

1

Which of the following is a way of working out which way the force on a wire will act?

2

What sort of force is generated when the current and the magnetic field are parallel to each other?

3

In Fleming’s left hand rule, which finger represents the current?

4

What are the main components in a loudspeaker?

5

How do headphones generate sounds?

6

Which equation is used to calculate the force on a wire carrying a current at right angles to a magnetic field?

7

0.4 A flows in 0.1 m of wire in a 0.7 T magnetic field. What force acts on the wire?

8

In a dc motor, what is the function of the split ring commutator?

9

0.02 A flows in 0.1 m of wire in a 5 T magnetic field. What force acts on the wire?

10

A full circuit is maintained in an electric motor. How is this achieved?