# Obtain the Expression for Current Sensitivity of Moving Coil Galvanometer. - Physics

Obtain the expression for current sensitivity of moving coil galvanometer.

#### Solution

The sensitivity (i.e. current sensitivity) of a galvanometer is defined as the angle of deflection per unit current flowing through it.
If dθ is change in the deflection produced by a small change in the current dI, sensitivity (S) of the galvanometer is given by

S=(d theta)/(dI)

The current I flowing through a moving coil galvanomet er is given by

I=k/(nAB)theta where θ is the angle of deflection , N is its turns, A is area, B is magnetic induction & k is the couple per unit twist.

theta = (NAB)/k I

(d theta)/(dI)=(NAB)/k

S=(NAB)/k

Concept: Moving Coil Galvanometer
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