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Question

The amount of deflection of the magnetic needle in a galvanoscope depends on:

A
The amount of current passing through the insulated copper wire that is wound over it
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B
Magnetic strength of the magnetic needle
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C
Number of turns of the coil
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D
All the above
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Solution

The correct option is D All the above
The deflection in galvanometer is the defined by
τ=NBIA
The N is number of turns of coils.
B is magnetic strenght of magnetic needles
I is The amount of current passing through the insulated copper wire that is wound over it
A is area of coil contact with magnetic field.

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