Current Density MCQs

Practice Current Density MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Electromagnetic TheoryCurrent Density

The conduction current density J in an isotropic conductor is related to electric field E by?

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Correct Answer: A. J = sigma E

Explanation: Point-form Ohm's law is J=σE, where σ is conductivity.

Reference: Standard electromagnetic theory: current density

Question 2

Electromagnetic TheoryCurrent Density

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Correct Answer: A. A/m²

Explanation: Current density is electric current per unit cross-sectional area, measured in amperes per square metre.

Reference: Standard electromagnetic theory: current density

Question 3

Electromagnetic TheoryCurrent Density

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Correct Answer: B. 2×10^6 A/m²

Explanation: Area=2×10^-6 m², so J=I/A=4/(2×10^-6)=2×10^6 A/m².

Reference: Standard electromagnetic theory: current density