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A cell supplies a current of 0.9 A throu...

A cell supplies a current of 0.9 A through a `2 Omega` resistor and a current of 0.3 A through a `7 Omega` resistor. The internal resistance of the cell is

A

`2.0 Omega`

B

`1.2 Omega`

C

`1.0 Omega`

D

`0.5 Omega`.

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