(a) State the working principle of a potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emfs of two primary cells. Obtain the requiredexpression used for comparing the emfs.(b) Write two possible causes for one sided deflection in a potentiometer experiment.

(a) State the working principle of a potentiometer. With the help of t

1.	(a) State the working principle of a potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emfs of two primary cells. Obtain the requiredexpression used for comparing the emfs.(b) Write two possible causes for one sided deflection in a potentiometer experiment.
Answer» Solution :(b) Two possible causes for ONE sided deflection in a potentiometer EXPERIMENT are :1. Positive terminal of PRIMARY cell source e is not connected to point A, where positive terminal of DRIVER cell (battery) has been connected.2. Emf of driver battery is LESS than the unknown emf `epsi`

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