Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

Options

A. 40 `Omega`
B. `25 Omega`
C. `250 Omega`
D. `500 Omega`

Answer

C

Explanation

`(theta)/(i) = (5)/(10^(-3)) = 5000 , (theta)/(V) = 20`
`implies (theta//i)/(theta//V) = (5000)/(20) = 250`
`implies (V)/(i) = R = 250 Omega`.