JEE Main 2023 — Current Electricity Question with Solution
From: JEE Main 2023 (Online) 29th January Evening Shift
Question
With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is
(A) directly proportional to the length of the potentiometer wire
(B) directly proportional to the potential gradient of the wire
(C) inversely proportional to the potential gradient of the wire
(D) inversely proportional to the length of the potentiometer wire
Choose the correct option for the above statements :
Choose an option
Show full solutionCorrect option: C
Step-by-step explanation
A potentiometer is an electrical instrument used to measure the electromotive force (EMF) of a cell.
The sensitivity of a potentiometer is defined as the change in potential difference per unit length of the wire.
It is directly proportional to the length of the potentiometer wire (Option A), because a longer wire has a larger potential difference that can be measured.
It is inversely proportional to the potential gradient of the wire (Option C), because a smaller potential gradient results in a smaller change in potential difference per unit length.
Therefore, the correct answer is (C) A and C only.
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This is a previous-year question from JEE Main 2023, covering the Current Electricity chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.