NEET Physics Current Electricity Questions Solved

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

(1) 4 Ω

(2) 2 Ω

(3) 1 Ω

(4) 0.5 Ω

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