- Exam
- JEE Main
- Year
- 2023
- Date
- 29 January
- Shift
- Evening Shift
- Subject
- Physics
- Chapter
- Current Electricity
JEE Main 2023 · 29 January · Evening Shift · Physics · Current Electricity
With the help of potentiometer, we can determine the value of emf...
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:
Options
- AB and D only
- BA and C only
- CA only
- DC only
Correct answer
B. A and C only
Step-by-step solution
The basic principle of the potentiometer is that the potential drop across any section of the wire will be directly proportional to the length of the wire, provided the wire is of the uniform cross-sectional area and a uniform current flows through the wire.
Therefore, sensitivity of potentiometer wire is inversely proportional to potential gradient.
Sensitivity ∝ \dfrac{1}{\dfrac{V}{l}} ∝ \dfrac{l}{V}$