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1)

The sensitivity of the moving coil galvanometer is 'S'.If  a shunt of (18) the of the resistance of galvanometer is connected to moving coil galvanometer, its sensitivity becomes


A) S3

B) S6

C) S9

D) S12

Answer:

Option C

Explanation:

Given, S= G8 ............(i)

As, S=Gn1     ............(ii)

Comparing Eqs.(i) and (ii), we get

 G8=Gn1

    8=n-1

    n=8+1=9

 Since the range of the galvanometer is increased by nine times, therefore its sensitivity reduces to 19

   S'= S9