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Conducting Liquid

The coil of t...

Question

The coil of the moving coil galvanometer is wound over an aluminium frame

A

because aluminium is a good conductor

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B

because aluminium is very light.

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C

because aluminium is comparatively cheaper

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D

to provide electro-magnetic damping.

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Solution

The correct option is D to provide electro-magnetic damping.
The coil of the moving galvanometer is wound over an aluminium frame to provide electro-magnetic damping because aluminium is diamagnetic and it does not interact with external magnetic field.

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