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Results tagged with electromagnetism
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user 45664
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.
1
vote
Accepted
Mathematical description of a wave source that doesn't permeate all space
A time-space domain description works better than a frequency domain description. Your complex exponentials are frequency domain descriptions. Time-space domain descriptions include pulse like waves …
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0
votes
How do we go from having electric and magnetic fields to an electromagnetic wave?
... I don't understand how we get from a "field" to a "wave".
I'm not really interested in detailed mathematics of how this happens,
rather I'm looking for a complete high-level answer ...
High leve …
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2
votes
Is there a general solution for 3d Wave equation?
You ask:
The general solution for 1D Wave equation is generally given as
f(kx-wt)+g(kx+wt)
Is there such general solution for the 3D Wave equation
The answer is yes.
First note that general solution …
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6
votes
Intuitively, why does putting capacitors in series decrease the equivalent capacitance?
Think of two simple capacitors each consisting of two plates each with area A separated by distance D. If they are connected in series the bottom plate of the upper capacitor is shorted to the top pl …
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2
votes
Accepted
Propagation of EM waves
The waveforms that define the shapes of the electric and magnetic fields travel through space at the propagation speed, c, along with electromagnetic energy.
An analogy--Think of waves traveling in …
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0
votes
Accepted
Phase difference between current and voltage related to the frequency of the applied field
The phase difference (or phase angle) in a 'load' is a function of the load's complex impedance and also the frequency of the applied voltage. So in your case plug in the numbers and write conductivi …
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4
votes
Physical difference between retarded and advanced green's function in Electrodynamics
In one dimension the advanced solution would propagate in the +x direction and the retarded solution in the -x direction. In three dimensions the advanced solution would be an expanding spherical wav …
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2
votes
Why is magnetic field zero for open circuit and electric field zero for short circuit?
If the resistor is shorted, then for the $E$ field since $V=IR$, if $R=0$ then $V=0$ so $E=0$.
If the circuit is open $I=0$, then for the magnetic field $B=(uI)/(2\pi r)$ and if $I=0$ then $B=0$.
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2
votes
Are there different types of superposition?
Superposition is a result of linearity. If the system is linear then $f(x+y) = f(x)+ f(y)$ which is superposition and which applies to both of your examples.
See https://en.wikipedia.org/wiki/Superp …
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0
votes
Accepted
What is longitudinal and transverse component of electric field?
See for electromagnetic waves:
https://www.quora.com/Are-electromagnetic-waves-transverse-waves-or-longitudinal-waves
In a transverse wave the oscillation of the field is perpendicular to the direct …
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7
votes
How to generate electric current without a permanent magnet?
Piezo electric cells convert mechanical energy to electric energy
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0
votes
Why does current increase in step-down transformer?
Why does current increase in step-down transformer?
Ideally power in equals power out so VI in equals VI out.
For example if volts in is halfed current out is doubled.
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