A galvanometer of resistance $25\,\Omega $ gives full scale deflection for a current of $10$ milliampere, is to be changed into a voltmeter of range $100\, V$ by connecting a resistance of $‘R’$ in series with galvanometer. The value of resistance $R$ in $\Omega $ is
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(d) $R = \frac{V}{{{i_g}}} - G = \frac{{100}}{{10 \times {{10}^{ - 3}}}} - 25 = 9975\,\Omega $
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