Two cells of E.M.F. E(1) and E(2)(E(2)gt...

Two cells of E.M.F. `E_(1)` and `E_(2)(E_(2)gtE_(1))` are connected in series in the secondary circuit of a potentiometer experiment for determination of E.M.F. The balancing length is found to be 825 cm. Now when the terminals to cell `E_(1)` are reversed, then the balancing length is found to be 225 cm. The ratio of `E_(1)` and `E_(2)` is

`2:3`

`4:7`

`7:4`

none of these

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