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Question

We should pivot the compass needle on a sharp pin to _______.

A
minimise the magnetic effect on the pin
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B
maximise the friction between the pin and the compass needle
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C
minimise the friction between the pin and the compass needle
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D
ensure it doesn't get affected by other magnets
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Solution

The correct option is C minimise the friction between the pin and the compass needle
By pivoting the compass needle on a fixed pin, the friction between the needle and the fixed pin is minimized and the compass needle can rotate freely in the magnetic field.

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