All Questions
Tagged with electromagnetic-induction magnetic-fields
513
questions
6
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3
answers
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Suspicious EMF equation
Some context: I am trying to get the equation of motion for a dipole magnet falling through copper pipe. To proceed I need to calculate the EMF. We can do this by using Faraday's law,
$$\oint_{\...
6
votes
1
answer
531
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If a loop is not complete, and magnetic field passing through it is changing; will their be emf induced in the loop?
In a setup like the one show in the figure:
Will there be an induced EMF across the loop(given that the field is increasing)?
(my dilemma is : since the loop is not complete, we cannot define the ...
- 63
6
votes
3
answers
217
views
Ring Magnet with a wire in the middle
I have a very specific question concerning a system with a magnet and a wire.
Consider a ring magnet with a magnetic field directed right through its center. In the center of the magnet is a wire, ...
- 89
6
votes
2
answers
1k
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Direction of Hall current
A Hall current arises when electric currents transverse to a magnetic field exist. In this figure (found online), the Faraday current appears to be going upwards due to a magnetic field pointing into ...
- 649
6
votes
3
answers
13k
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How to find the direction of an eddy current?
Suppose there is a magnetic field going from left to right. Suppose a thin sheet of metal conductor (e.g. a 1m*1m square) is dropped through the magnetic field such that the plane of the conductor is ...
- 231
5
votes
2
answers
766
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How does electromagnetic induction work on an atomic level?
So far I have come to know that changing magnetic field (or flux) creates current. This is also known as Faraday's law of electromagnetic induction. The direction of the current is opposite to the ...
- 817
5
votes
2
answers
412
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Fundamental, intuitive interpretation of the magnetic field $\vec{H}$
In many electrodynamics/magnetism textbooks it is stated that the magnetic induction $\vec{B}$ is related to the magnetic field $\vec{H}$ via $\vec{B}=\mu_0(\vec{H}+\vec{M})$. It is then argued that $\...
- 1,006
5
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2
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Does changing the electric / magnetic field cause self-reinforcing induction of the other?
I understand that changing electric field produces magnetic field and changing magnetic field produces electric field.
Are these produced magnetic and electric field produced due to one defined to be ...
- 5,481
5
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1
answer
13k
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Calculate electric field induced by a changing magnetic field
I want to plot the electric field (as a vector field plot) which is induced by a changing magnetic field for some simple cases.
Suppose for example that the magnetic field changes linearly (or ...
- 1,692
5
votes
3
answers
225
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Which is more correct - a changing $B$ field induces a current or an electric field?
I am in an introduction to Electricity and Magnetism class and we are using Griffiths. In example 7.8 on page 318, his solution says that the "changing magnetic field induces an electric field". But I ...
- 455
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3
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Do moving charges get affected by the magnetic field they create while moving to constitute current? If not, how can self-induction be possible?
Let a bunch of charge move with a constant velocity $\mathbf v\;.$ Since, the charges are moving, they would create magnetic field $\bf B$ as it is current that produces magnetic field.
Now, would $\...
user36790
5
votes
0
answers
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How to calculate the energy transfer between working coil and working piece and dissipated energy of working piece in induction heating?
For who don't know how does induction heating work, a short description can be found here.
However, my question is about physics. Assume I have a coil inductor calculated carefully 50 uH as below:
...
- 175
5
votes
4
answers
611
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Induction cooker + superconductive pot [closed]
What will happen if I put a super-conductive object on an induction cooker, and turn the cooker on?
- 359