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NEET 2018 · Moving Coil Galvanometer, Ammeter & Voltmeter

Moving Coil Galvanometer, Ammeter & Voltmeter question from NEET 2018

Q21NEET 2018Easy

Moving Coil Galvanometer, Ammeter & Voltmeter

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

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Answer: (c)

$I_s = \frac{\theta}{I}$ , $V_s = \frac{\theta}{V} = \frac{\theta}{IR}$ , so $R = \frac{I_s}{V_s}$ .
$I_s = 5\text{ div/mA} = 5000\text{ div/A}$
$R = \frac{5000}{20} = 250\ \Omega$
So the answer is (c) 250 $\Omega$ .

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