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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A potentiometer wire has a length of 10 m and resistance 4Ωm−1. An accumulator of emf 2V and a resistance box are connected in series with it. Culculate the resistance to be introduced in the box so as to get a potential gradient of (a) 0.1 V/m and (b) 0.1m Vm/s.

A potentiometer wire has a length of 10 m and resistance 4Ωm−1. An accumulator of emf 2V and a resistance box are connected in series with it. Culculate the resistance to be introduced in the box so as to get a potential gradient of (a) 0.1 V/m and (b) 0.1m Vm/s.

A thin uniform wire AB of length 1 m an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips consisting of two resistors X and Y together in parallel with a meter long constantan wire of uniform cross section. Which the help of a movable contact D Figure shows a meter bridge (which is nothing but a practical Wheatstone bridge) if one decides to balance a resistance of 4 X against Y In a meter bridge experiment null point is obtained at 20 cm. from one end of the wire when resistance X is balanced against another resistance Y. If XltY then where will be the new position of the null point from the same end