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Results tagged with electromagnetism
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user 106192
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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does a one bar electric fire exhibit electron decay?
What you have is a resistive heater; the electrical energy goes through a high resistance metal, just like in a toaster, and the wire heats up.
This is conversion of electrical energy to heat; no ele …
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Ampere's circuital law and the type of surface to be used
It's an application of Stoke's theorem: https://en.wikipedia.org/wiki/Stokes%27_theorem
I find "Div, Grad, Curl and All That", by H.M. Schey, to be a great introduction to how and why vector calculus …
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Understanding the Faraday tensor
Though a tensor can be treated as a single geometric object, independent of any particular basis, the process of measurement usually requires the establishment of a definite basis, and you will then p …
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Why does an oscillating electric field couple more strongly to electrons than to ions?
The mass of the electron is thousands of times less than that of the ions - about 1,800 times lighter than a proton. The motions move the entire ion core, so inertia tends to resist the change of mot …
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If a magnetic monopole travels through a wire loop, which way does the current flow in the c...
Your electric field should be anti-clockwise; your illustration has it clockwise. The diagram from the Wikipedia article is reproduced below; the magnetic monopole diagram is the lower figure, in …
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Accepted
Front velocity and Superluminal group velocity
Superluminal group velocity can occur in near absorption peak, known as regions of anomalous dispersion. So-called "superluminal tunneling" experiments have bee conducted in thes regions, but when car …
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Are EM radiation and EM waves the same thing?
EM waves are a special case of electromagnetic radiation, where typically the source is periodic, or near enough that there is a carrier wave, as with radio and television.
Maxwell's equations suppor …
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How to calculate the force of attraction experienced by free electrons in metals?
For a simplified, semi-classical model, see Drude model. With this approach the interior of the metal is shielded from the effects of the bound particles, and they can be ignored except when (a) ther …
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What will happen when two similar photons incident on a free metal electron simultaneously?
When multiple photons arrive simultaneously it is the same as if a single photon of the same total energy arrived. See multi-photon absorption. This is easy to generate with ultrafast laser pulses, …
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Accepted
Will the electrons interact with the e.m wave in the below condition?
If you could do this, the electrons would not see the resultant non-wave.
You can analyze this with water or sound waves, as well as EM waves. Mathematically, start a sine wave from the left, and an …
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Scalar and Vector Potential
The vector potential has a divergence of zero; we can obtain some intuition by considering the geometry required by the divergence theorem: the volume integral of the divergence of the vector potentia …
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What is the QED model about half wave plate?
A wave plate is a passive component, and can be modelled as a unitary operator on the quantum state. The state is a superposition of left and right circular polarized photons, and the operator gradual …
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Wave Velocity vs. Phase Velocity
Wave velocity, when not otherwise specified, usually means the phase velocity: the rate at which the phase travels in space.
This site animates the differences between phase and group velocities. The …
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What would happen if a magnet was pushed towards a copper tube in space?
Faraday's Law of Electromagnetic Induction predicts that the relative motion of the magnet and the copper tube will result in the presence of eddy currents in the tube; . The force relationship is de …
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A Formula for the Phase Difference Between the Electric and Magnetic Wave Oscillations?
The electric and magnetic fields are always in-phase if the wave can be treated as a plane wave (which simply means it cannot be too close to the source), and in vacuum or any medium with linear respo …
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