Figure shows the circuit of a potentiometer. The length of the potentiometer wire AB is 50 cm. The emf of the battery is 4 volt, having negligible internal resistance. Values of resistances R1 and R2 are 15 ohm and 5 ohm respectively. When both the keys are open, the null point is obtained at a distance of 31.25 cm from end A. Given resistance of wire AB = 10 Ω.

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Figure shows the circuit of a potentiometer. The length of the potentiometer wire AB is 50 cm. The emf of the battery is 4 volt, having negligible internal resistance. Values of resistances R₁ and R₂ are 15 ohm and 5 ohm respectively. When both the keys are open, the null point is obtained at a distance of 31.25 cm from end A. Given resistance of wire AB = 10 Ω.

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