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A galvanometer of resistance 20Omega sho...

A galvanometer of resistance `20Omega` shows a deflection of 10 division when a current of 1 mA is passed through it. If a shunt of `4Omega` is connected and there are 50 division on the scale, the range of the galvanometer is

A

A)`1 A`

B

B)`3 A`

C

C)`10 mA`

D

D)`30 mA`

Text Solution

Verified by Experts

The correct Answer is:
D
Current for 50 divisions,
`I_(g)=(1xx50)/(10)=5mA`
`therefore (I_(g))/(I)=(S)/(S+G)`
`implies I=((S+G)/(S))I_(g)`
or `I=((4+20)/(4))5mA=30mA`
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