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In a potentiometer experiment , the bala...

In a potentiometer experiment , the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of `2Omega`, the balancing length becomes 120 cm. Find the internal resistasnce of the cell.

A

1 ohm

B

0.5 ohm

C

4 ohm

D

2 ohm

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