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In a potentiometer experiment two cells ...

In a potentiometer experiment two cells of e.m.f. E and E are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the olarity of E is reversed, then the balancing length becomes 29 cm . The ratio `(E_(1))/(E_(2))` of the e.m.f. of the two cells is

A

`1 : 1`

B

`2 : 1`

C

`3 : 1`

D

`4 : 1`

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