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Two batteries one of the emf3V, internal...

Two batteries one of the emf3V, internal resistance In and the other of emf l SV, internal resistance `2Omega` are connected in series with a resistanceR as shown. If the potential difference between points a and b is zero, the resistance R is :

A

`5Omega`

B

`7Omega`

C

`3Omega`

D

`1Omega`

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The correct Answer is:
A
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