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Results tagged with electromagnetism
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user 38737
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.
2
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Sign convention for EMF
When we define the field generate by EMF, why there is not negative sign in $\mathcal{E} = \oint \vec{E} \cdot d\vec{l}$?
Usually we talk about potential, there should be a negative sign, right?
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An EM problem of polarized sphere
Today, I'm doing an EM problem and my question is exactly the same as this site shows:
http://www.physicsforums.com/showthread.php?t=133501
To reiterate my confusion, why we can't use that integral …
- 269
3
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answers
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The position of center of mass of electron cloud in an atom
I read Griffiths EM today and it says something very interesting but a little bothering to me. It states for an atom, the position of center of mass of an electron cloud lies in the center of the prot …
- 269
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question on dipole moment of water molecule
I read a line today and don't get it: "Molecules with mirror symmetry like oxygen, nitrogen, carbon dioxide, and carbon tetrachloride have no permanent dipole moments."
http://hyperphysics.phy-astr.g …
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answer
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Electric field generated by a point charge moving at the speed of light
As you see, this is the electric field generated by a point charge moving at constant speed v. I know that when $v$ -> 0, $E$ is just the Coloumb Law. But how do you interpret $E$ when $v$ -> $c$ ? …
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