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Sensitivity of a moving coil galvanometer can be increased

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by increasing the number of turns.

by decreasing the area of the coil.

by increasing the couple per unit twist of the suspension fiber.

by decreasing the strength of the radial magnetic field.

answer is A.

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Detailed Solution

Sensitivity of a moving coil galvanometer is

$\frac{θ}{i} = \frac{nAB}{C} where n is the no of turns,$

$B is the strength of the radial magnetic field$

$A is the area of the coil$

$and C is the couple per unit twist of the suspension fiber .$

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