All Questions
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How can we use the electrostatic boundary conditions for electromagnetic waves?
The boundary conditions for an electromagnetic wave passing from one linear dielectric media to the other (both having no free charges or current) are taken as:
$$B_{\perp_1} -B_{\perp_2} =0$$
$${\...
CommunityBot
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Measure Earth Magnetic Field using Hall Effect
This is about Hall Effect from this youtube video at here. The voltage across a metal will change based on the strength of the magnetic field. I am wondering whether this will be accurate in reading ...
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Does a charge moving in the direction of electric field produce EM wave?
I am a 12th grade student and our teacher told us that a accelerated charge particle produce EM wave .So a charge particle moving in the direction of electric field or a charge particle moving in a ...
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Electromagnetic influences in electric field
Let us imagine a charge $q$ in space. At each point in space,there is an electric field vector associated with it. Now we start moving the charge in a direction. We know that electromagnetic ...
- 1,179
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Feynman on Inverse Square Law of EM Radiation
I've been reading through (and listening to) a collection of lectures form Richard Feynman's Lectures on Physics. In lecture #2, titled "Basic Physics", he makes the following statement:
Although ...
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Creation of magnetic field from charge [duplicate]
We know that a static charge only produces an electric field and a charge in motion (be it constant velocity or accelerated) creates both magnetic and electric field. But recently I came across that &...
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Relativistic correction of Coulomb's Law
I am attempting to describe Coulomb's law but with the delay one would get because of the light speed limit. I am aware one could do that using Maxwell's equations because they are relativistic, but ...
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Electromagnetic field potentials
Good afternoon for everyone. I have a question in attitude towards the electromagnetic potentials. There are two terms showing two forms of Maxwells equations for electrostatic potential and vector ...
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Can electron remain still?
Imagine we have a hollow metallic toroid, with copper wire winded around it, which carries electric current. That implies we have magnetic field inside the hollow toroid. The toroid has vacuum inside. ...
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Why magnetic and electric field static
When charge moves at a constant speed, it is said that it produces static magnetic and electric field.
Why static ? If it moves, at every points, electric field and magnetic field change as they are ...
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Why are not kinks produced for constant speed charge?
Why arent kinks produced when the charge moves at constant velocity in the same linear direction ?
I am asking this because this is the backbone of why EM wave is not created for constant velocity ...
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Why does the kink has the following vector direction?
I imagine the kink to be the following image in the EM wave.
On the image, we see the charge movement 2 times and each one is very small movement. Even though it is small, it is easy to see why each ...
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Isolated Electric and Magnetic fields
From what I know, wherever there is an electric field that is propagating, there will be a magnetic field present too, because that's what an EM wave comprises of- if it is going to carry energy, we ...
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How the potential energy of the dipole is $m.\vec{B}$ when work done by any magnetic field is Zero?
We know that magnetic fields don't do any work on ANY CHARGE from the form of Lorentz force we have here. But we still have magnetic dipole getting oriented by external magnetic fields. Now, intuition ...
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In a van de Graaf generator, when a spark happens, is an electromagnetic wave produced? If yes, in which direction?
In a van de Graaf generator, when a spark happens, electrons moves from one globe to the other globe.
Is an electromagnetic wave produced?
If an electromagnetic wave is produced, why is it produced?
...
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