In a galvanometer, the deflection becomes one half when the galvanometer is shunted by a $20\,\,\Omega$ resistor. The galvanometer resistance is ............... $\Omega$
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$I_{g}=\frac{20}{20+R_{g}} I \Rightarrow \frac{1}{2}=\frac{20}{20+R_{g}}$
$20+R_{g}=40 \Rightarrow R_{g}=20 \Omega$
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