JEE Main 2003 Physics question
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 cm from the positive end, the e.m.f. of the battery is
Answer: (4)
Solution
Taking the full wire (100 cm) to correspond to the standard e.m.f. E, the potential gradient is per cm. At balance no current flows through the battery, so its internal resistance has no effect
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