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NEET 2015 (AIPMT) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from NEET 2015 (AIPMT)

Q182NEET 2015 · AIPMTMedium

Kirchhoff's Laws & Measuring Instruments

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be

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Answer: (c)

Ammeter resistance: $480 \| 20 = \dfrac{480 \times 20}{500} = 19.2\ \Omega$ .
Total $R = 40.8 + 19.2 = 60\ \Omega$
$I = \dfrac{30}{60} = 0.5\text{ A}$ . So the answer is (c).

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