All Questions
Tagged with electromagnetic-induction magnetic-fields
513
questions
3
votes
1
answer
539
views
Can $F=qvB$ be applied to a solenoid and a parallel moving magnet?
If you take a scenario like this,
Charge gathers at either end, and if you could somehow form a complete circuit without there being a canceling effect, there would be a current flowing. This makes ...
- 347
3
votes
1
answer
890
views
Magnitude of induced Electric field
Let us suppose there is a uniform magnetic field present in all space, pointed into the screen.
If this magnetic field varies with time, Electric fields will be produced that in turn produce fields ...
- 113
3
votes
1
answer
1k
views
Do magnets attract magnetic materials by inducing magnetism in them?
Here are 2 concise excerpts from a book I have been reading:-
1.A permanent magnet produces its own magnetic field. An induced
magnet is a material that becomes a magnet when it is placed in
a ...
3
votes
1
answer
461
views
Lenz' law and magnetic moment
Lenz Law says that the induced current will circulate in a direction such that it produces a magnetic field that is opposite to the change of applied magnetic field. For example, if the loop is a ...
- 890
3
votes
1
answer
1k
views
Disc permanent magnet as homopolar generator
It is known that Faraday disk generator produces voltage even when the magnet is rotating along with conducting disk.
Does that mean that only rotating, axially magnetized magnet could be used to ...
- 113
3
votes
2
answers
2k
views
Why is a current induced as a wire perpendicularly traverses a uniform magnetic field?
The magnitude of an induced E.M.F, according to Faraday's law, is proportional to the rate of change of magnetic flux linkage.
As the field is uniform, the field strength, or magnetic flux density, ...
- 1,819
3
votes
1
answer
294
views
Induction equation in a rotating frame
In his book, Tom Cravens refers to the induction equation (perfectly conducting limit) in a rotating frame, the Sun. See link below:
https://books.google.com/books?id=xw50iZep-McC&pg=PA222&...
- 41
3
votes
1
answer
6k
views
Ed Leedskalnin's "Perpetual Motion Holder" (PMH)
Edward Leedskalnin (Coral Castle) describes a perpetual motion holder in his writings. I've built one and pretty much know how it works (I think). It is NOT a perpetual motion device by any means, ...
- 2,637
3
votes
2
answers
7k
views
Derivation of Faraday's law using Lorentz force?
For a stationary loop of wire with a time varying magnetic field $\vec{B}(t)$ through it. Is it possible to derive Faraday's law, using only the Lorentz force
$$\vec{F}=q \vec v\times \vec B \tag {1}$...
3
votes
2
answers
4k
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Magnetic fields in transformers and back emf?
i am having some trouble with understanding the magnetic fields inside transformers and how they relate to back emf.
My first query is: is the magnetic field produced inside the soft iron core ...
- 3,997
3
votes
4
answers
878
views
Why isn't Magnetic force doing any work on the rod?
Consider the situation given below :
The rod (of length $l$ and of some resistance "r") connecting the two rails is given a velocity $v$ in the direction shown. Now since this motion ...
- 8,230
3
votes
0
answers
309
views
Force exerted by one current carrying wire loop on another [closed]
I am training for my physics exam and I stumbled upon this question:
We are given two current carrying wire loops with radii $R_1 \ll R_2 $
who are coaxial. The distance between them is $X$. Both ...
- 143
3
votes
1
answer
2k
views
Torque on a rotating sphere in a uniform magnetic field
Consider a uniform magnetic field. We know that if we have a conductive loop rotating in this magnetic field then we get a current running through that loop due to Faraday's Law, which in turn exerts ...
- 158
3
votes
0
answers
231
views
flux threading through superconducting ring
I have been confused over the wording used in this paper describing RSFQ logic circuits: http://www.mukhanov.com/uploads/LikharevSemenov-RSFQReview_IEEETAS91.pdf
From page 6: " If such a single flux ...
- 101