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Two cells when connected in series are b...

Two cells when connected in series are balanced on `8 m` on a potentiometer. If cells are connected with polarities of one the cellis reversed, they balance on `2 m`. The ratio of e.m.f.'s of the two cellsis

A

`3:4`

B

`4:3`

C

`3:5`

D

`5:3`

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The correct Answer is:
D
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