State the working principle of potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emf's of two primay cells. Obtain the required expression used for comparing the emfs. Write two possible causes for one sided deflection in a potentiometer experiment.
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Fall of potential across any portion of the wire is directly proportional to the length of that portion of the wire provided the wire is of uniform area of cross-section and a constant current is flowing through it.
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