Question

When a current of `5mA` is passed through a galvanometer having a coil of resistance `15Omega`, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into to voltmeter of range `0-10V` is
A. `2*535xx10^3Omega`
B. `4*005xx10^3Omega`
C. `1*985xx10^3Omega`
D. `2*045xx10^3Omega`

Answer 1

Here, `I_g=5xx10^-3A`, `G=15Omega`, `V=10V`,
`R=V/I_g-G=(10)/(5xx10^-3)-15`
`=2000-15=1*985xx10^3Omega`