In the potentiometer circuit arrangement, the balancing length $A C$ is measured to be 250 cm . When

Question

In the potentiometer circuit arrangement, the balancing length $A C$ is measured to be 250 cm . When the galvanometer connection is shifted from point (1) to point (2) in the given diagram, the balancing length becomes 400 cm . The ratio of emf of two cells, $\frac{\varepsilon_{1}}{\varepsilon_{2}}$ is\

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(c)\