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Describe the EMF induced by a magnetic field
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[QUOTE="andrewkirk, post: 5170705, member: 265790"] I'm a little rusty on this stuff, but isn't the question hinting at inductance, which creates an 'inertia' in the flow of electric current. So when the switch is first flicked on, the inductance from the coils gives a magnetic field that resists the increase in current (ie the emf from the mag field is in the opposite direction of the current), and when the switch is flicked off, the inductance gives an emf that resists the decrease (ie the mag-induced emf is in the same direction as the current). In any case, a quick glance at Maxwell's laws should answer it. Edit to Add: That's kind of true, but needs rewording to something like "only external magnets not associated with an infinitesimally small part of the circuit can induce an emf on that part" When you have a straight wire, this means there's no emf against the increasing current. But when you coil the wire, you are bringing the mag fields from [I]other[/I] parts of the circuit close to [I]this[/I] part of the circuit, so they [I]can[/I] produce an emf on it. [/QUOTE]
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Describe the EMF induced by a magnetic field
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