Uses of magnetism

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Question 8
Medium
a.

Explain two similarities and two differences between the operation of an electric motor and an AC generator.

[4]
b.

The diagram shows a straight wire positioned in the magnetic field between the South pole (on the left) and the North pole (on the right) of a magnet.

A U-shaped magnet with its South pole on the left and North pole on the right. A straight wire passes through the gap between these poles from the front toward the back. The wire is connected in a circuit with a battery and a switch. The battery's positive terminal is on the left and the negative terminal is on the right, so conventional current flows from the positive terminal, through the wire from front to back, and back to the negative terminal when the switch is closed.

Describe and explain what happens to the wire when the switch is closed.

[3]
c.

A current of 3.5 A3.5\text{ A}3.5 A passes through a wire with a length of 0.80 m0.80\text{ m}0.80 m.

The wire is in a magnetic field of magnetic flux density 0.45 T0.45\text{ T}0.45 T.

Calculate the force acting on the wire.

Give your answer to 2 significant figures.

[3]

Uses of magnetism Questions

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