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A resistance box, a battery and a galvan...

A resistance box, a battery and a galvanometer of resistance `G` ohm are connected in series. the galvanometer is shunted by resistance of `S` ohm, find the change in resistance in the be required to maintain the current from the battery unchanged.

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The correct Answer is:
A, B, C, D
Net resistance should remain unchanged
`: R+G=R'+(GS)/(G+S)`
`:.R'-R=G-(GS)/(G+S)=G^2/(G+S)`
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