A galvanometer havings a coil resistance of 60 Ω shows full scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents upto 5.0 amp by (a) putting in series a resistance of 15 Ω (b) putting in series a resistance of 240 Ω (c) putting in parallel a resistance of 15 Ω (d) putting in parallel a resistance of 240 Ω

Answer: (c). An ammeter needs a shunt in parallel: S = (IgG)/(I - Ig). S = (1 × 60)/(5 - 1) = 15 Ω So the answer is (c) a 15 Ω resistance in parallel.

A galvanometer havings a coil resistance of 60 Ω shows full scale… | NEET 2009 (AIPMT)

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Moving Coil Galvanometer, Ammeter & Voltmeter

A galvanometer havings a coil resistance of 60 $\Omega$ shows full scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents upto 5.0 amp by

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Answer: (c)

An ammeter needs a shunt in parallel: $S = \frac{I_gG}{I - I_g}$ .
$S = \frac{1 \times 60}{5 - 1} = 15\ \Omega$
So the answer is (c) a 15 $\Omega$ resistance in parallel.

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