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JEE Main Physics Class 12 Current Electricity Part 1 Questions

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Question : 95

Total: 100

. The length of a wire of a potentiometer is 100 cm, and the e. m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5Ω. If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is
where i is the current in the potentiometer wire

30E
100.5
30E
(100−0.5)
30(E−0.5i)
100
30E
100

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