A) increasing the emf of the cell
B) increasing the length of the potentiometer wire
C) decreasing the length of the potentiometer wire
D) None of the above
Correct Answer: B
Solution :
Sensitivity of potentiometer \[\propto \frac{1}{potential\text{ }gradient}\] But potential gradient \[=\frac{V}{L}\]where, Vis the emf of the cell and L is the length of the wire. \[\therefore \]Sensitivity of a potentiometer \[\propto \frac{L}{V}\] Sensitivity of a potentiometer \[\propto L\] Therefore, sensitivity of a potentiometer can be increased by increasing the length of the potentiometer wire.
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