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  4. The resistance of a moving coil galvanometer is 20Ω. It requires 0.01A current for full scale deflection. Calculate the value of resistance required to convert it into a voltmeter of range 20 volt:-

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Q. The resistance of a moving coil galvanometer is $20\Omega.$ It requires $0.01A$ current for full scale deflection. Calculate the value of resistance required to convert it into a voltmeter of range $20$ volt:-

NTA AbhyasNTA Abhyas 2020

Solution:

$V=i\left(R + S\right)$
$20=\left(0 . 01\right)\left(20 + S\right)$
$\rho =1980\Omega$