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ConceptPotential Difference and Emf of a Cell

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#### Question

In the following potentiometer circuit, AB is a uniform wire of length 1 m and resistance 10 Ω. Calculate the potential gradient along the wire and balance length AO (= *l*).

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When 5 V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5 x 10^{-4} m/s. If the electron density in the wire is 8 x 10^{28} m^{-3}, calculate the resistivity of the material of the wire.

Solution for question: In the Following Potentiometer Circuit, AB is a Uniform Wire of Length 1 m and Resistance 10Ω. Calculate the Potential Gradient Along the Wire and Balance Length Ao (= L). concept: Potential Difference and Emf of a Cell. For the courses 12th CBSE (Arts), 12th CBSE (Commerce), 12th CBSE (Science)