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JEE Main 2020 (8 Jan, Shift 2) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from JEE Main 2020 (8 Jan, Shift 2)

Q137JEE Main 2020 · 8 JAN · SHIFT 2Easy

Kirchhoff's Laws & Measuring Instruments

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?

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Answer: (c)

Series resistance $R = \frac{V}{I_g} - G$ .
$R = \frac{10}{10^{-3}} - 100 = 10000 - 100 = 9900\ \Omega = 9.9\text{ k}\Omega$
So the answer is (c) 9.9 k $\Omega$ .

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