All Questions
Tagged with electromagnetic-induction magnetic-fields
513
questions
4
votes
2
answers
418
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Why would a moving infinite region of magnetic field exert an electric force?
I'm confused about the Lorentz force in relation to the frame of reference. There are many questions about that here, but I still don't get it. I've tried to break it down to the most basic example.
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- 165
4
votes
5
answers
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How does the Poynting vector know who is the primary and who is the secondary of a transformer?
I've read in several places that the Poynting vector is directed from the primary to the secondary of a transformer (we assume here that the primary is the winding that provide the AC energy, while ...
- 487
4
votes
6
answers
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Induced electric field inside a perfect conductor
If I have a magnetic field and I place a coil that is a perfect conductor in this field that I'm rotating.
This would mean that there is a change in the flux through the area of the coil which would ...
- 335
4
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answer
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Is there is any way to prove the Faraday's law of induction?
I want to know if there is any way to prove the Faraday's law or is it just an experimental observed phenomena?
More specifically, is there any reason why the proportionality constant is 1? How did ...
- 170
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2
answers
9k
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Why does induced current depend on the area of a loop of wire?
My year 12 physics textbook teaches the concept of electromagnetic induction in a rather unintuitive way. Perhaps it is not being thorough. Perhaps I am not being thorough in reading it. Here is my ...
- 167
4
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2
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3k
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Cause of electromagnetic induction?
The rate of change of magnetic flux through a surface (open) is related with the line integral over the closed loop binding the selected surface by one of the Maxwell's equation. But that means even ...
- 3,148
4
votes
3
answers
298
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Voltage across rod in time varying magnetic field
If a slim conductor of some length $l$ and diameter $d\ll l$ is placed in a magnetic field $B$, and the field is changed by $\frac {dB}{dt}$, what (if any) is the voltage $V$ induced across the ends ...
- 141
4
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2
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868
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Use of tungsten as an insulator in an induction heater
One problem in induction heating is that energy is lost because the object being heated radiates energy, that energy then heats the coils (which are water cooled) and the coils suck away the energy.
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- 4,494
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Why is there no induced electric field in the experiment (Faraday's Law)
Below are three circuit diagrams for each of Faraday's experiments that allowed Faraday to come up with Faraday's Law. In Griffiths' Introduction to Electrodynamics Griffiths states (on page 302 of ...
- 518
4
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1
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Induced magnetic field produces electric field and vice versa forever!
So here are the two of Maxwell's laws that I am interested in:
So we have the simple circuit (from google):
So, before the system goes into steady-state we know that charge slowly accumulates on the ...
- 7,720
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0
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EMF induced in a loop around a solenoid - Faraday's law
Since the magnetic field outside the solenoid is negligible, it is impossible to detect current in the solenoid from outside.
Suppose I put a conducting loop of large radius, say, $10^9 $ km around ...
- 410
4
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923
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Lighting an Electric Bulb with Earth's Magnetic Field
Yesterday, I was solving some problems of Electromagnetic Induction. Suddenly a thought struck my mind.
Earth has its own magnetic Field.If an aircraft of metallic body is flying in the air then ...
- 41
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2
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How does Newton's third law apply to magnetism?
As a magnet passes through a solenoid, currents are induced in the wire with an angular momentum. Since the induced magnetic solenoid repels the magnet linearly, it cannot allow for the conservation ...
user86425
4
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2
answers
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Why in electrostatics is $dV=-E.dr$ but in electromagnetic induction, $EMF=+E.dS$?
In electrostatics we learned that $$dV=-E.dr$$.
I understood the derivation which was used to derive this.
Now when I have come to Electromagnetic Induction,I see that when there is a time varying ...
- 733