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A potentiometer is sued for the comparis...

A potentiometer is sued for the comparison of emf of two cells `E_(1) and E_(2)`. For cell `E_(1)` the no deflection point is obtained at 20cm and for `E_(2)` the no deflection point is obtained at 30cm. The ratio of their emf's will be

A

`2//3`

B

`3//2`

C

1

D

2

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