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A primary cell has an e.m.f. of 1.5 volt...

A primary cell has an e.m.f. of 1.5 volt. When `5 Omega` resistance is connected in the circuit, it gives a current of 0.2 ampere. The internal resistance of the cell is :

A

0.5 ohm

B

1.25 ohm

C

2.5 ohm

D

5 ohm.

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