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Results tagged with electromagnetism
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user 30481
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.
3
votes
5
answers
18k
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How to use Ampere's Law for a semi-infinite wire with current?
Suppose that there is a semi-infinite wire which extends to infinity only in one direction. There are no other circuit elements at the other end(finite end) of the wire and the current does not loop. …
- 4,936
2
votes
0
answers
210
views
Electrodynamics boundary conditions with complex $\epsilon$ and $\mu$
I wonder if the usual derivation for boundary conditions at an interface given in EMT textbooks hold for complex permittivity and/or permeability? Do the fields carry phase information themselves(i.e. …
- 25k
1
vote
Derivation of Jefimenko's Equation in Jackson's EMT book
$$\frac{\nabla'\times \vec{J}}{R}=\nabla'\times(\frac{\vec{J}}{R})-\frac{\vec{J}\times(\nabla'R)}{R^2}$$
Thanks to Prof. Y. F. Chen I was able to figure it out. While in the integral the first term o …
- 327
3
votes
2
answers
4k
views
Derivation of Jefimenko's Equation in Jackson's EMT book
I have been trying to understand the derivation of Jefimenko's equation in Jackson on p.246-247 which can be seen in the photographs attached. First of all I did not fully comprehend the transformatio …
- 327