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Electromagnetic TheoryCurrent Density

A conductor of cross-sectional area 2 mm² carries a uniform current of 4 A. The current density magnitude is?

  • A2×10^3 A/m²
  • B2×10^6 A/m²
  • C8×10^6 A/m²
  • D0.5×10^-6 A/m²
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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
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