A galvanometer together with an unknown resistance in series is connected to two…

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A galvanometer together with an unknown resistance in series is connected to two identical batteries each of 1.5 V. When the batteries are connected in series, the galvanometer records a current of 1 A, and when the batteries are in parallel the current is 0.6 A. What is the internal resistance of the battery? (a) r=23 Ωr = \frac{2}{3}\,\Omega (b) r=25 Ωr = \frac{2}{5}\,\Omega (c) r=13 Ωr = \frac{1}{3}\,\Omega (d) r=32 Ωr = \frac{3}{2}\,\Omega

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