A galvanometer of resistance `50Omega` is connected to a b attery of 3V alongwith a resistance of `2950Omega` in series. A full scale deflection of 30 division is obtained in the galvanometer in order to reduce this deflection to 20 division. The resistance in sereis. should be:-

Options

A. `6050Omega`
B. `4450Omega`
C. `5050Omega`
D. `5550Omega`

Answer

2

Explanation

`I_(2)=(3)/(50+2950)prop30I_(g)=(3)/(50+R) prop20`
`rArr(50+R)/(50+2 950)=(3)/(2)rArr50+R=4500`
`rArrR=4450Omega`