In a meter – bridge, a cell of e.m.f. 4V and internal resistance 1 ohm is connected in the ...

In a meter – bridge, a cell of e.m.f. 4V and internal resistance 1 ohm is connected in the left gap and a resistance of 8 ohm is connected in the right gap as shown in the circuit diagram. What is the e.m.f. of the cell E, if the null deflection is observed in the galvanometer at 50 cm from point A? The resistance of wire AB is 3 ohm.
a) 0.5 V
b) 0.25 V
c) 0.75 V
d) 1.00 V

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