All Questions
Tagged with electromagnetic-induction magnetic-fields
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Length of helix in one time period [closed]
How to find the length of a helix in one time period?
In the case of a particle suspended at the origin and a magnetic field along the $y$ axis we know that the time period will be equal to $2\pi/aB$ ...
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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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How does magnetic hysteresis (ie. the $B$-$H$ curve) transform the input-output of a guitar pickup or speaker?
I understand that magnetically dependent equipment like a guitar pickup or speaker are affected by magnetic hysteresis.
Here is an article discussing the effect on speakers for example. That article ...
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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 ...
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Internally, what defines whether a material is magnetically hard or soft?
I know that magnetically hard materials hold magnetic fields (magnetic moment alignment) for longer, while soft metals do not. However, what, internally, causes these properties to arise?
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Do transformers return current to source when magnetic field collapse at primary coil?
When we close the circut containing an inductor and a battery, the current starts flowing, which builds magnetic field around inductor, changing magnetic field produces its own current in opposite ...
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Confused between induced emfs
We know when flux of B changes an EMF is induced in loop
And also when a rod moves in mag field Potential difference between its ends is also produced.
So is this ques while writing Potential equation
...
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Self-inductance of $N$ turns coil to current loop [duplicate]
I saw nice problem, that tricked my mind. The system is:
Given that the coil has self-inductance of $L$, with diameter $D$ and $N$ turns. Now we take the coil, and open the turns to form single loop. ...
- 206k
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1
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Mutual inductance - induced magnetic flux in the primary
Let there be two coils, L1 (with self inductance L1), and L2, with self inductance L2.
The first coil is connected to a sinusoidal supply, and the second one is connected to a resistor load, as shown ...
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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 ...
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Magnetic flux and number of turns
The number of windings is not written in the magnetic flux formulas in high school textbooks, but I come across articles saying that the number of windings affects the magnetic flux formulas. Is this ...
- 206k
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Magnetic energy terms of system of three circuits
Say we've got a system of coplanar circuits like in the picture with same electric current flowing through them
We know that a system of circuits has magnetic energy
$$\mathcal U_{\,\mathrm m}=\dfrac{...
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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 ...
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How does any changing magnetic field induce voltage?
Hopefully the title puts in well enough;
a charged particle moving in a magnetic field experiences the Lorentz-Force. If this occurs in a wire and part of the circuit is outside the B-Field then a ...
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The direction of the induced electric field
Recently I got stuck witht the following problem.
Imagine we have uniform a magnetic field which induction points upwards. The fields strength is steadily decreasing. If we put an iron coil ...
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