Sensitivity of moving coil galanometer is 'S'. If a shunt of `(1/6)` th of the resistant of galvanometer is connected to moving coil galvanometer, its sensitivity becomes.

Options

A. `s/3`
B. `s/6`
C. `s/9`
D. `s/12`

Answer

C

Explanation

`S=G/8, S=G/(n-1)`
`therefore G/8=(G)/(n-1)`
`therefore 8=n-1`
`therefore n=8+1=9`
Since range of galvonometer in increased nine times its sensitivity reduces to `1/9`
`therefore S'=s/9`