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A potentiometer wire of resistance 7r, length 42cm is connected in series with a battery of emf V, internal resistance r and external resistor 2r as shown. At null deflection the balancing length is found to be 5cm. The ratio of the emf of the two cells ę/V will be ?

A potentiometer wire of resistance 7r, length 42cm is connected in series with a battery of emf V, internal resistance r and external resistor 2r as shown. At null deflection the balancing length is found to be 5cm. The ratio of the emf of the two cells ę/V will be ?

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Grade:12

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