### Abstract

In introductory texts Ampere's law is generally introduced in the steady-current form , and it is later extended to a more general form ^{1–4} involving the socalled displacement current ,

(1)

Here the line integral is to be taken along a closed

Amperian loop, and

I is the net conventional

current that penetrates any surface bounded by the loop. In its steady-current form (without

), Ampere's law is used to find the

magnetic field generated by highly symmetric arrangements of current-carrying wires, for example, an infinite straight line of

current or an infinite solenoid, in analogy with Gauss's law.

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