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A battery is connected to a potentiomete...

A battery is connected to a potentiometer and a balance point is obtained at `84 cm` along the wire. When its terminals are connected by a `5 Omega` resistor, the balance point changes to `70 cm`.
Calculate the internal resistance of the cell.

A

`4 Omega`

B

`2 Omega`

C

`5 Omega`

D

`1 Omega`

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