Question

what happen with null point when length of potentiometer wire is increased by keeping potential difference constant

Answer 1

Answer:

If the value of R is increased, the current through the wire will decrease which in turn decreases the potential difference across AB, and hence potential gradient (k) across AB decreases. Thus, with the increase of l, which will result in increase in balance length.

Answer 2

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❤.In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire x cm long. If the length of the potentiometer wire is increased without changing the cell, the balancing length will (Driving source is not changed) A