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Two identical calls send the same curren...

Two identical calls send the same current in `2 Omega` resistance, whether connected in series or in parallel. The internal resistance of the cell should be

A

`1 Omega`

B

`2 Omega`

C

`1/2Omega`

D

`2.5 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
In series, `i_(1) =(2E)/(2 + 2r)`
In parallel, `i_(2) =E/(2 + r/2) = (2E)/(4 + r)`
Now, `i_(1) = i_(2) rArr (2E)/(2 + 2r) = (2E)/(4 + r)`
`rArr r = 2Omega`
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