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 galvanometerresistance is 50 ohm, the current drawnfromthecell will be :

A

2.0 A

B

1.0 A

C

0.2 A

D

0.1 A