First slide

Moving coil Galvanometer

Question

Sensitivity of a moving coil galvanometer can be increased

Easy

A

by increasing the number of turns.
B

by decreasing the strength of the radial magnetic field.
C

by decreasing the area of the coil.
D

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

Solution

Sensitivity of a moving coil galvanometer is $\frac{θ}{i} = \frac{n A B}{C} w h e r e n i s t h e n o o f t u r n s, B i s t h e s t r e n g t h o f t h e r a d i a l m a g n e t i c f i e l d A i s t h e a r e a o f t h e c o i l a n d C i s t h e c o u p l e p e r u n i t t w i s t o f t h e s u s p e n s i o n f i b e r .$

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