A galvanometer with resistance `1000Omega` gives full scale deflection at `0*1mA`. What value of resistance should be added to `1000Omega` to increase its current range `10A`.

Options

A. `0*01Omega` in series
B. `0*01Omega` in parallel
C. `0*10Omega` in series
D. `0*10Omega` in parallel

Answer

B

Explanation

Here, `G=1000Omega`, `I_g=0*1mA=10^-4A`,
`I=10A`
`S=(I_gG)/(I-I_g)=(10^-4xx1000)/(10-10^-4)`
`=0*01A` in parallel.