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NEET 2014 (AIPMT) · Moving Coil Galvanometer, Ammeter & Voltmeter

Moving Coil Galvanometer, Ammeter & Voltmeter question from NEET 2014 (AIPMT)

Q23NEET 2014 · AIPMTEasy

Moving Coil Galvanometer, Ammeter & Voltmeter

In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be

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Answer: (c)

Common voltage across $G$ and $S$ : $I_gG = IR_A$ , where $R_A$ is the ammeter resistance.
$R_A = \frac{I_g}{I}G = 0.002G$
$R_A = \frac{G}{500}$
So the answer is (c) $\frac{1}{500}G$ .

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