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Two cells of emf E(1) and E(2) ( E(1) gt...

Two cells of emf `E_(1)` and `E_(2) ( E_(1) gt E_(2))` are connected in series to potentiometer for balancing length 625 cm . When polarity of `E_(2)` is reversed then balancing length becomes 125 cm. Then the ratio `(E_(1))/(E_(2))` is

A

` 3:2`

B

` 3:1`

C

`5:1`

D

`2:1`

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