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A potentiometer wire is 100 cm long hand...

A potentiometer wire is `100 cm` long hand a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obatined at `50 cm` and `10 cm` from the positive end of the wire in the two cases. The ratio of emfs is:

A

`3:4`

B

`3:2`

C

`5:1`

D

`5:4`

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