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The e.m.f. of a standard cell balances a...

The e.m.f. of a standard cell balances across 150 cm length of a wire of potentiometer. When a resistance of `2Omega` is connected as a shunt with the cell, the balance point is obtained at 100cm . The internal resistance of the cell is

A

`0.1 Omega`

B

`1 Omega`

C

`2 Omega`

D

`0.5 Omega`

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