What is the formula of potentiometer?
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It is calculated as V/L, where V is the potential difference between two points and L is the distance between two points. Also K = (IρL/A)/L = Iρ/A. E1/E2 = L1/L2 is the equation to compare the emf of two cells, where E1 and E2 are the emf and L1 and L2 are the length at which it is balanced
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Potentiometer is a device used to compare the e.m.f. (electromotive force) of two cells, to measure the internal resistance of a cell, and potential difference across a resistor. It consists of a long wire of uniform cross-sectional area and of 10 m in length.
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