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  • A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvannometer is<div class='qna-

A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvannometer is

Option: 1

\frac{S^{2}}{\left ( S+G \right )}


Option: 2

\frac{SG}{\left ( S+G \right )}


Option: 3

\frac{G^{2}}{\left ( S+G \right )}


Option: 4

\frac{G}{\left ( S+G \right )}


Answers (1)

Effective resistance should remain equal to G

G=\frac{G.S}{G+S}+R\Rightarrow G^{2}+GS=GS+RG+RS 

= R=\frac{G^{2}}{G+S}

Posted by

Ramraj Saini

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