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7 cells each of emf epsilon and internal...

7 cells each of emf `epsilon` and internal resistance `r` are to be connected in series. If due to oversight one cell is connected wrongly, the emf and internal resistance of the combination will be :

A

`7 xi, 7r`

B

`5 xi, 5r`

C

`7 xi, 5r`

D

`5 xi, 7r`.

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