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A cell supplies a current of 0.3 A throu...

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

A

2.0 ohm

B

1.2 ohm

C

1.0 ohm

D

0.5 ohm

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