CUET · PHYSICS · PYQ PAPER 2023
A current of \(1.0\) mA is flowing through a potentiometer wire of length 4 m and of resistance \( 40 \, \Omega \). The potential gradient of the potentiometer wire will be :
- A \( 10^{-1} \text{ V/m} \)
- B \( 10^{-2} \text{ V/m} \)
- C \(10^{-4} \text{ V/m} \)
- D \(10^{-3} \text{ V/m} \)
Answer & Solution
Correct Answer
(B) \( 10^{-2} \text{ V/m} \)
Step-by-step Solution
Detailed explanation
\( V = IR \) \( V = (1.0 \times 10^{-3} \text{ A})(40 \, \Omega) = 40 \times 10^{-3} \text{ V} \) \( k = \frac{V}{L} \) \( k = \frac{40 \times 10^{-3} \text{ V}}{4 \text{ m}} = 10^{-2} \text{ V/m} \)
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