High frequency current passes through a wire what will happen
Answers
An alternating current (AC) flow can be induced in a conductor by an alternating magnetic field, as per the law of electromagnetic induction. Conversely, an AC flow in a conductor causes (alternating) magnetic fields, within and around the conductor. Now, when the magnitude of the current through a conductor is changing, the magnetic field also changes. This, in turn, produces a current which opposes the originally changing current. (Think of it as electromagnetic inertia).
It is found that the “counter-electromotive force (EMF)” or back EMF (10 dollar words for electromagnetic inertia) are the strongest at the center of a conductor, and therefore, the current density (current per unit area) is the maximum at the surface of a conductor and decreases exponentially from its value at the surface, toward the center. Without getting into too much detail, this should intuitively answer why for higher frequencies, most of the current flow is at the surface (higher frequency = higher rate of change of current = more back EMF, most of which is at the center).