All Questions
16
questions with no upvoted or accepted answers
2
votes
0
answers
48
views
Position of the electric field induced by a magnetic field
I've been told that a cylindrical time-varying magnetic field induces a non-conservative electric field shaped like circles centred at the axis of the cylindrical magnetic field. I suppose it's an ...
- 265
1
vote
0
answers
57
views
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
1
vote
0
answers
47
views
Incongruent expressions for $E$- and $B$-fields based on approach
I am having two issues with Maxwell's equations in the following problem:
A thin conducting disc has radius a thickness b and electrical
resistivity ρ. It is placed in a uniform time-dependent ...
- 545
1
vote
1
answer
57
views
Motional EMF inside material with resistance
A square loop is cut out of a thick sheet of material with each side of resistance R. It is then placed
so that the top portion is in a uniform magnetic field B, and is allowed to fall under
gravity.
...
- 105
1
vote
0
answers
106
views
Is this analogy of Induced emf correct?
I have searched PSE (and many other sites on internet) for the theoretical reason of induced emf. All I got was that the phenomenon of Induced EMF is experimental fact and can only be mathematically ...
- 876
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 ...
0
votes
0
answers
27
views
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
0
votes
0
answers
23
views
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
47
views
Can ionized air be used as a conductive medium for eddy brakes?
Sort of a conceptual engineering question, apologies if I am missing something, my background is in mechanical engr.
Essentially, I was inspired by the classic experiment of dropping a magnet in a ...
0
votes
2
answers
583
views
Is the induced electric field generated due to the separation of charges in a moving wire in a magnetic field non-conservative?
As the title suggests, whenever there is a moving wire in a magnetic field of constant magnitude, an induced voltage is produced. Now, due to the separation of charges, which is a result of the ...
- 1
0
votes
1
answer
61
views
Is there a circulating $E$ field when a single straight wire cuts a magnetic field?
I am a little confused as to the difference between the Lorentz force and Faraday’s induced emf, specifically in the case of a straight wire moving through a uniform B field. I know the answer is that ...
- 103
0
votes
1
answer
66
views
How is a current induced in this translating wire?
I am familiar with the principles of electromagnetic induction, but I am stuck on the scenario below: a long straight wire is translating in a uniform magnetic field. According to my book, this causes ...
- 368
0
votes
2
answers
293
views
Induce electric field in an incomplete circular conducting loop
I was solving a numerical example(image1) of 'Griffiths book of electrodynamics'
And in this solution it is given that if there is a changing magnetic field is there there would be induce induce ...
- 178
0
votes
1
answer
388
views
Infinite charged sheet kicked into motion - Electric field direction?
In volume two of the Feynman Lectures on Physics, Chapter 18, here: http://www.feynmanlectures.caltech.edu/II_18.html
There is a scenario in which an infinitely extending charged sheet is suddenly ...
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