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