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Galvanometer

The current s...

Question

The current sensitivity of a moving coil galvanometer depends on

A

the number of turns in the coil

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B

moment of inertia of the coil

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C

current sent through galvanometer

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D

eddy current in A1 frame

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Solution

The correct option is A the number of turns in the coil
Current sensitivity $= \frac{n B A}{K}$
where K is constant of torsional rigidity.

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Q. Obtain the expression for current sensitivity of moving coil galvanometer.

Q. In the moving coil galvanometer
N= number of turns; A= cross sectional area; B= Magnetic field; C= Torsional constant; I= current, R= resistance

List I		List II
(P)	Torque action on the coil	(1)	NAB /C
(Q)	Deflection produced	(2)	NAB/CR
(R)	Current sensitivity	(3)	NIAB
(S)	Voltage sensitivity	(4)	NABI/C

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