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The electromotive force of a primary cel...

The electromotive force of a primary cell is 2 volts. When it is short- circuited is gives a current of 4 amperes. It internal resistance in ohms is

A

`2.0 Omega`

B

`5.0Omega`

C

`0.5Omega`

D

`8.0Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
`l=E/(r+R).` When short circuited, external resistance = 0
`4=2/rrArrr=2/4=0.5Omega`
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