CUET · PHYSICS · PYQ PAPER 2023
Which of the following represents Ohm's law for a conducting material?
- A \( R = VI \)
- B \( \vec{J} = \sigma \vec{E} \)
- C \( \vec{J} = \rho \vec{E} \)
- D \( I = RV \)
Answer & Solution
Correct Answer
(B) \( \vec{J} = \sigma \vec{E} \)
Step-by-step Solution
Detailed explanation
The correct answer is B) \(\vec{J}=\sigma \vec{E}\), which is the microscopic form of Ohm's law. It states that the current density ( \(\vec{J}\) ) at any point in a conductor is proportional to the electric field \((\vec{E})\) at that point, with the constant of proportionality…
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