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The deflection in a M.C.G. is reduced to...

The deflection in a M.C.G. is reduced to half , when it is shunted with a `40 Omega` coil. The resistance of the galvanometer is

A

`60Omega`

B

`40Omega`

C

`20Omega`

D

`10Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
From problem (67),we have ,
`(S)/(S+G)=(theta)/(theta) therefore (12+G)/(12)=(50)/(10)`
`therefore G=48Omega`.
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