Question

The resistance of the four arms P, Q, R and S in a
Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90
ohm, respectively. The e.m.f. and internal resistance of the
cell are 7 volt and 5 ohm respectively. If the galvanometer
resistance is 50 ohm, the current drawn from the cell will be
(a) 0.2 A (b) 0.1 A [2013]
(c) 2. 0 A (d) 1. 0 A

Answer 1

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