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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

`1Omega`

B

`2Omega`

C

`0.5Omega`

D

`2.5Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
Given, `l_"series"=l_"parallel"`

`l_s=(E+E)/(r+r+R)=(2E)/(2r+R)`
`l_p=E/(r/2+R)=(2E)/(r+2R)`
Since, `l_s=l_p`
`(2E)/(2r+R)=(2E)/(r+2R)`
`rArr" "2r+R=r+2R`
`rArr" "r=R`
`rArr" "r=2Omega`
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