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NEET 2010 (AIPMT, Prelims) · Moving Coil Galvanometer, Ammeter & Voltmeter

Moving Coil Galvanometer, Ammeter & Voltmeter question from NEET 2010 (AIPMT, Prelims)

Q26NEET 2010 · AIPMT · PRELIMSEasy

Moving Coil Galvanometer, Ammeter & Voltmeter

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

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Answer: (a)

Voltmeter: $V = I_g(G + R) \Rightarrow R = \frac{V}{I_g} - G$ .
$R = \frac{30}{0.03} - 100 = 1000 - 100 = 900\ \Omega$
So the answer is (a) 900 $\Omega$ .

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