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NEET 2007 (AIPMT) · Moving Coil Galvanometer, Ammeter & Voltmeter

Moving Coil Galvanometer, Ammeter & Voltmeter question from NEET 2007 (AIPMT)

Q29NEET 2007 · AIPMTMedium

Moving Coil Galvanometer, Ammeter & Voltmeter

The resistance of an ammeter is 13 $\Omega$ and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is

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Answer: (a)

At full scale the meter still carries $100$ A; the shunt carries $750 - 100 = 650$ A.
Same p.d.: $100 \times 13 = 650 \times S$
$S = \frac{1300}{650} = 2\ \Omega$
So the answer is (a) $2\ \Omega$ .

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