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Question 31616
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Current Electricity: Current Density MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Current DensityHardQuestion 31616

Question

Current density J in a conductor is related to electric field E by:
  1. A
    J = E/ρ
    Correct
  2. B
    J = ρE
  3. C
    J = ρ/E
  4. D
    J = E²/ρ

Correct answer

J = E/ρ

Explanation

J = σE = E/ρ where σ is conductivity (σ = 1/ρ). This is the microscopic form of Ohm's law.

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