Abstract
We point out that in the course of application of Ampère’s law it is important to fulfil the condition of continuity. We emphasize the role of the displacement current in the case of non-closed circuits. As a didactical example the magnetostatic field generated by the current of a finite-length straight wire is analysed. It is shown that in order to apply Ampère’s law one needs to (a) complete the scheme with the necessary appearance of displacement currents, or (b) ensure the continuity at the singularities by numerous infinite-length straight wires. Supplements are also added to the standard method when the magnetostatic field of a solenoid is calculated via Ampère’s law.
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