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(A) Ampere's circuital law,in its original form,relates the line integral of the magnetic field $\vec{B}$ around a closed loop to the steady current $

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Steady current

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(A) Ampere's circuital law,in its original form,relates the line integral of the magnetic field $\vec{B}$ around a closed loop to the steady current $I$ passing through the surface enclosed by the loop: $\oint \vec{B} \cdot d\vec{l} = \mu_0 I$.This original form is strictly valid only for steady currents (direct current) that do not change with time.For time-varying currents,the law is incomplete and must be modified by adding the displacement current term,as proposed by Maxwell,to become the Ampere-Maxwell law: $\oint \vec{B} \cdot d\vec{l} = \mu_0 (I_c + I_d)$,where $I_c$ is the conduction current and $I_d$ is the displacement current.Therefore,in the context of the standard Ampere's circuital law taught in introductory physics,it is considered true for steady currents.

Ampere's law is true for which type of current?

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