NEET Physics Current Electricity Questions Solved

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

(1) 30E100

(2) 30E100.5

(3) 30E(1000.5)

(4) 30(E0.5i)100, where i is the current in the potentiometer

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