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

The amount of current passing through the insulated copper wire that is wound over it

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Magnetic strength of the magnetic needle

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Number of turns of the coil

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All the above

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Solution

The correct option is D All the above
The deflection in galvanometer is the defined by
$τ = N B I A$
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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