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Question

As shown in the experimental setup, two cells with the same emfE and different internal. resistance r1 and r2 are connected in series to an external resistance R. Value of R so that the potential difference across the cell be zero, is :

640160_6792b8afa7a84caba2eab14bbc4a6645.png

A
r1+r2
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B
r1r2
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C
r1r2
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D
r1r2
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Solution

The correct option is B r1r2
i=2ER+r1+r2
ir2+iR=E
2r2+2R=R+r1+r2 or R=r1r2

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