A galvanometer can withstand safely a maximum current of \( 5 \math...

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A galvanometer can withstand safely a maximum current of \( 5 \mathrm{~mA} \). It is converted into voltmeter reading upto \( 20 \mathrm{~V} \) by connecting in series an external resistance of \( 3960 \Omega \). The resistance of galvanometer is
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