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Results tagged with electromagnetism
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user 153810
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 doI find the average induced emf in a coil given the rate of change of flux density, and...
The magnetic flux density changes from +10 T to -10T in 5 seconds. The area of the coil is 2.5 m^2. What is the average emf induced?
By Faraday's law, this will be equal to the change in magnetic fl …
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Why is there an emf induced across the width of a metal sheet when it is moved across a unif...
By Faraday's law, the flux is constant, so there will be no emf. But each electron in the metal sheet is moved at some speed, so it will experience a force, and as a result, electrons will accumulate …
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Why does linear motion not affect the reading on a hall probe?
Moving the hall probe forward at velocity v would make all the electrons in it propel at velocity v, so the magnetic force on each electron (qV x B ) would increase. If so, unless there's some fuzzy s …
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What is magnetic flux? How is it related to Faraday's law?
For example, how do we explain Faraday's wheel using Faraday's law? There should be no emf induced since the flux is constant. Also, if we are given a magnetized material, and we somehow manage to cha …
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How does Lenz law conserve energy in this case?
A magnet is falling into the coil as shown. The current in the coil creates a magnet as shown ( by the right-hand grip rule ). Now, as the magnet falls towards the coil, the magnetic field strength in …
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How do I visualize the 'phases' of these two waves in this example?
Fig 4.1 shows a displacement-distance graph for two electromagnetic waves A and B of the same frequency and amplitude. Wave A is travelling to the right and wave B is travelling to the left.
The per …
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