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

A primary cell has an e.m.f. 1.5 volt. When short circuited, it gives a current of 3 ampere. The internal resistance of the cell is

A

4.5 ohm

B

2 ohm

C

0.5 ohm

D

1/4.5 ohm

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