The resistances 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

1. A. 1.0 A
2. B. 0.2 A
3. C. 0.1 A
4. D. 2.0 A

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