The discussion revolves around the question of whether a strong magnet can induce an electromotive force (EMF) in a copper wire solenoid from a distance, particularly in the context of Faraday's law of electromagnetic induction. Participants explore the conditions under which EMF might be induced, including the relative motion of the magnet and the solenoid, and the strength of the magnet.
Participants express differing views on whether a magnet can induce EMF in a solenoid from a distance, with some asserting that it cannot unless the magnet passes through the coil, while others propose that a sufficiently strong magnet might still induce EMF at a distance. The discussion remains unresolved with multiple competing views present.
Participants highlight the dependence on the strength of the magnet and the orientation of its movement relative to the solenoid, as well as the specific conditions under which Faraday's law applies. There is uncertainty regarding the exact conditions necessary for EMF induction.
RaulTheUCSCSlug said:Faraday's law is strictly for coiled wire I thought. So I don't think emf would be induced if a normal bar magnet crosses a copper wire. If it did, then it would probably depend on which way the magnet is moving (parallel to the wire or perpendicular to the wire). But as far as I know it has to be a magnet passing through a coil.
I believe it'll depend on how strong the magnet is..The coil is having air core which has very low permeability..If the magnet is strong enough (I don't know exactly how much),it will induce emf in the coil even being away from the coil..Abhilash Goyal said:Just take an example, a copper solenoid(closed circuit connected to a voltmeter) is kept vertically on a table, and a strong bar magnet is passed near it approx 20 cm away, would there be any reading in the voltmeter ?