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Electromagnetic TheoryAmpere's Law

A long straight wire carries 10 A. The magnetic field intensity H at a distance 0.1 m from it is approximately?

  • A1.59 A/m
  • B15.9 A/m
  • C50 A/m
  • D100 A/m
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Correct Answer: B. 15.9 A/m
Explanation: H=I/(2πr)=10/(2π×0.1)≈15.9 A/m.
Reference: Standard electromagnetic theory: ampere's law
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