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

(1) 1 Ω

(2) 0.5 Ω

(3) 4 Ω

(4) 2 Ω

Answer 1

The correct answer is