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A potentiometer has uniform potential gr...

A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6 m and 2 m respectively on the potentiometer wire. The e.m.f.’s of the cells are in the ratio of

A

`1 : 2`

B

`1 : 1`

C

`3 : 1`

D

`2 : 1`

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