Ampere's Law MCQs

Practice Ampere's Law MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Electromagnetic TheoryAmpere's Law

For an infinitely long straight conductor carrying current I in a medium of permeability mu, the magnetic flux density at radial distance r is?

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Correct Answer: A. mu I/(2 pi r)

Explanation: Using Ampere's law around a circular path gives H=I/(2πr), hence B=μI/(2πr).

Reference: Standard electromagnetic theory: ampere's law

Question 2

Electromagnetic TheoryAmpere's Law

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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

Question 3

Electromagnetic TheoryAmpere's Law

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Correct Answer: A. Enclosed conduction current

Explanation: For magnetostatics, ∮H·dl equals the net current enclosed by the contour.

Reference: Standard electromagnetic theory: ampere's law