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  4. A galvanometer having a coil resistance 100 Ω gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V ?

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Q. A galvanometer having a coil resistance $100\,\Omega$ gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V ?

JEE MainJEE Main 2020Moving Charges and Magnetism

Solution:

$i_{g}=1\,mA, R_{g}=100\,\Omega$
$V=i_{g}\left(R+R_{g}\right)$
$10=1\times10^{-3}\left(R+100\right)$
$R=9.9\,k\Omega$

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