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Results tagged with magnetic-fields
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user 271720
For questions that utilize the concept of magnetic fields (commonly denoted by the letter B), or for questions whose answers likely involve magnetic fields. More specific than the [magnetism] tag, as questions about the phenomenon & theory of magnetism do not necessarily involve the discussion of fields.
2
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1
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Why isn't the magnetic field density zero here?
In my lecture notes for magnetostatics, my professor has this explanation of why H is not necessarily $0$ that I dont understand.
$$\nabla \times \bf{H} = \bf{J} \\ \bf{J}=0 \Rightarrow \nabla \times …
- 285
0
votes
1
answer
264
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Eelectric and magnetic field inside a conductor cavity
Assume we have an external field outside a conductor that has cavity inside. I know that E field is 0 inside that cavity for electrostatic and time varying case but I dont understand what happens to t …
- 285
0
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1
answer
112
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Faraday's law. Why does the induced current flow this way?
We have this stationary loop in a time-varying B-field. The current I (in red) is induced by the changing field B(t). This current in turn induces a B field that opposes the changing field due to righ …
- 285
2
votes
0
answers
60
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How is magnetic dipole "created"?
I know that the electric dipole can be created when the electron cloud is displaced realative to the nucleus. I am trying to draw parallel to this and to better understand this topic, so please help m …
- 285
0
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1
answer
35
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Trouble with enterpreting Faraday's Law
$$ \nabla \times \textbf{E} = -\frac{\partial \textbf{B}}{\partial t} $$
My interpretation of this equation is that:
A steady magnetic field will result in an electric field that is $0$.
A varying ma …
- 285
1
vote
3
answers
1k
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Why is the curl of magnetic field $0$ outside the conductor and non-zero inside? [duplicate]
I dont understand why the magnetic field does not curl outside the cable, according to this example, since I would expect the magnetic field lines to go back on themselves around the cable like shown …
- 285
0
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2
answers
3k
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Is Earth's North pole actualy a South pole?
As far as I am concerned, the compass is facing along the magnetic field lines on the Earth's surface which in turn points towards the North pole by its design. But for a magnet, the field lines go fr …
- 285