![]() will generate a current which tries to prevent the magnetic field from changing. The basic principle of an inductor is that the magnetic field has some intrinsic "inertia." If the magnetic field through some loop isn't constant, an electromotive force develops around the boundary of the loop charges which are free to move under the influence of this e.m.f. In the approximation that the freshly-connected battery is only pushing current along the outgoing wire, this high- inductance makes it a little more obvious that the current cannot instantaneously start moving down the entire outgoing wire. ![]() Let’s imagine that the long cable to nowhere is not pair of parallel wires, but instead that the "outgoing" and "return" wires are wrapped around an iron core, like a transformer. Transmission-line problems can be counterintuitive for people who are used to thinking about the moving charges in circuit but are used to ignoring the fields. ![]()
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