Discussion
Ampere's circuital law states that the line integral of \( \mathbf{H} \) round a closed path equals
Answer: C
Written \( \oint \mathbf{H} \cdot d\mathbf{l} = I_{enc} \), it is the magnetic counterpart of Gauss's law and is the quickest route to the field of any arrangement with enough symmetry. In terms of B the permeability would appear as a factor.
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