All Questions
79
questions
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3
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78
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Work done in a moving conducting bar and in a Faraday disk
I deeply apologize for my ignorance, but I am asking this since I still can't seem to grasp what my teachers relayed to me a few days ago about two exercises that I solved in an intrinsically wrong ...
0
votes
0
answers
39
views
What is the induced electric field in a moving conducting material in a magnetic field?
I've been taught that the induced EMF in a conductor is the rate of change of flux in it, but Maxwell's equation
$$
\nabla\times\vec{E} = -\dfrac{\partial\vec{B}}{\partial t},
$$
only states so for ...
2
votes
1
answer
55
views
Does making a magnet move require more energy than a non-magnet?
I know that electric fields store energy, with their energy in an infinetesimal volume being proportional to $E^2$ at that point. I also know that a moving magnet creates an electric field (...
- 531
0
votes
1
answer
36
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Induced Electric field due to magnetic field in Faraday experiment
Regarding this experiment where a magnet is moved in and out of a coil -(see the picture)
what i considered to be true is that when there is a changing magnetic flux through the coil(due to changing ...
- 367
6
votes
4
answers
727
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How do Electric and magnetic fields generate each other (mathematically)?
Regarding electromagnetism, a changing magnetic flux$(\phi_B)$ produces emf by-$$EMF= -\frac{d \phi_B}{dt}\tag1$$
This emf creates a current which again creates a magnetic field given by-(bio-savart ...
- 367
0
votes
2
answers
36
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Inducing electric field vs Inducing magnetic field
Is it easier to induce an electric field using a changing magnetic field or the other way around?
The question is from my high school booklet, and I am pretty sure it was to be answered on an ...
- 15
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0
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27
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Does the Change in Area Not Affect EMF Calculation in a Time-Varying Magnetic Field?
I had this Question as a Homework :
Given a conducting frame of width $𝐿$. A mobile conductor is mounted on the knitting needle that moves on the closing one at speed $\vec{𝒗} = 𝑣\hat{x}$ while ...
- 101
1
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3
answers
108
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How current is induced when there is a change in external magnetic field?
If still charges in a wire loop do not respond to a(or have their own) magnetic field, then how is current is generated by changing a magnetic field? And why only a changing magnetic field? What ...
- 25
0
votes
1
answer
179
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Explaining Faraday's Law With Lorentz Transformations of $E$ and $B$ Fields
I've searched around for this but haven't come across a totally satisfying explanation yet. I'm trying to build a relatively simple model of how the Lorentz Transformations of the $E$ and $B$ fields ...
- 43
1
vote
0
answers
54
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Static toroidal magnetic field rotating inside toroidal winding
what would happen if I took a toroidal core, generated a static toroidal magnetic field in the core and then rotated the core around it's symmetry axis within a larger stationary toroidal winding ...
- 91
0
votes
1
answer
23
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Energy transmission from opposite magnetic field vectors. A wire with a current in a homogenous magnetic field
This is my first post and also the first time I've ever tried understanding a physics concept by approaching it with my own math logic so tips on trying to do this more effectively are also welcome
I’...
- 5
0
votes
0
answers
23
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Sources of Eddy current and hysteresis in linear materials
Following is an excerpt about transformer on load from Kothari and Nagrath, Electrical Machines.
The value of exciting current $i_0$ has to be such that the required MMF is established so as to ...
- 421
0
votes
0
answers
22
views
How does proximity of a grounded conductor effect an electric / inductive field (and practical application)
My apologies - I'm missing a couple years of learning to be able to ask this question well, to know the right terminology.
Suppose a grounded conductor, such as a 12mm copper water pipe.
The grounded ...
0
votes
1
answer
96
views
Conducting rod moving in magnetic field on a railing problem
We have a conducting rod (lenght $l$) moving with constant velocity $v$, on two symmetrical railings, and and everything is conducting. Rod has some resistivity $\rho$, while railings are purely ...
- 2,042
0
votes
2
answers
157
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Is the concept of motional EMF consistent with Faraday's Law?
Consider a circular homogeneous metallic coil sliding on a smooth horizontal surface in a region of uniform magnetic field $B$ which is perpendicular to the face of the coil. By Faraday's law, the net ...
- 341