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In a potentiometer experiment, two cells...

In a potentiometer experiment, two cells of emf `E_1` and `E_2` are used in series in the secondary circuit. The balancing length is found to be 58 cm. If the polarity of `E_2` is reversed, the balancing length becomes 29 cm. The ratio `E_1//E_2` of the emfs of two cells is :

A

`1 : 1`

B

`2 : 1`

C

`3 : 1`

D

`4 : 1`.

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