The length of a wire of a potentiometer is 100 cm

PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity

Problem

The length of a wire of a potentiometer is 100 cm, and the emf of its standard cell is EE volt. It is employed to measure the emf of a battery whose internal resistance is 0.5 ohm. If the balance point is obtained at 30 cm from the positive end, the emf of the battery is (a) 30E100\frac{30E}{100} (b) 30E100.5\frac{30E}{100.5} (c) 30E(100−0.5)\frac{30E}{(100 - 0.5)} (d) 30(E−0.5i)100\frac{30(E - 0.5i)}{100}, where ii is the current in the potentiometer

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