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Results tagged with electromagnetism
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user 222195
The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
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How much time does it take for a broken magnet to recover its poles?
I believe you seem to be worried about the effect of the physical disturbances on the domain arrangement caused by the cutting process. If my assumption is right, then to return both derivatives to th …
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Force between two magnets
I have a case where I need to calculate the force per area (pressure) between two flexible magnets of equal shape and dimensions (2000×25×5mm). I'm trying to figure out what strength of each magnet is …
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Does V=IR define resistance for any conductor?
The equation/formula $V=IR$ is named the ohm's law. The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827. Any conductor that has current passing through has som …
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Magnetic force between broken magnetic circuit
The above image shows the flux flow through a rectangular core. We know the purpose of the core is to concentrate as much of the flux through it as possible, so we'll assume no or minimal stray fiel …
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How does back emf occur if a system can’t do work on itself?
The lost energy you're looking for is what is stored in the field as potential, and it's not lost (at least a major part of it) but preserved. When a current runs through a conductive wire, a magnetic …
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Why isn't there any current in the primary if secondary circuit is opened in a transformer?
It doesn't. A transformer works by magnetic induction between the two coils, it doesn't matter whether the secondary is loaded or not. The primary, if connected to a source of current, conducts just f …
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Accepted
How does a load/resistor affects a Transformer?
Just like how the induction coil in an induction motor feels the resistance of the load on the rotor. A magnetic field moving relative to a charged particle or vise versa experiences a force on it equ …
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What electric and magnetic field lines look like in some examples?
There exist a field interaction law as you know: like attract and unlike repels. The field line of a lone charged particle propagates radially outward as you must have learnt in school, but when brou …
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