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NEET 2011 (AIPMT, Mains) · Moving Coil Galvanometer, Ammeter & Voltmeter

Moving Coil Galvanometer, Ammeter & Voltmeter question from NEET 2011 (AIPMT, Mains)

Q25NEET 2011 · AIPMT · MAINSMedium

Moving Coil Galvanometer, Ammeter & Voltmeter

A galvanometer of resistance, G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is

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Answer: (d)

With the shunt the resistance becomes $\frac{GS}{G+S}$ ; to keep the main current unchanged the total must stay $G$ .
$R + \frac{GS}{G+S} = G$
$R = G - \frac{GS}{G+S} = \frac{G^2}{G+S}$
So the answer is (d) $\frac{G^2}{S+G}$ .

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