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 galvanometer is
${G \over {(S + G)}}$
${{{S^2}} \over {\left( {S + G} \right)}}$
$\left( {{{SG} \over {S + G}}} \right)$
${{{G^2}} \over {(S + G)}}$
Solution
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