Current Electricity and Electrical InstrumentHard

Question

In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2Ω the balancing length becomes 120 cm. The internal resistance of the cell is

Options

A.1 Ω
B.0.5 Ω
C.4 Ω
D.2 Ω

Solution

r = R = 2Ω

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