A galavanometer, whose resistance is 50 ohm has 25 divisions in it. When a current of `4xx10^(-4)` A passes through it,its needle (pointer) deflects by one division. To use this galvanometer as a volmeter of range `2.5V`, it is should be connected to a resistance of :

Options

A. 6200ohm
B. 200ohm
C. 250ohm
D. 6250ohm

Explanation

`i_(illustrate) =25 times 4 times 10^-4=10^-2 A`
For voltmeter
`10^-2=2.5/((50+R)) R=200`