All Questions
Tagged with electromagnetic-induction magnetic-fields
513
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If we apply a magnetic field to a core saturated by a permanent magnet, what will happen? [closed]
If we apply a magnetic field to a core saturated by permanent magnet, will the magnetic field of the permanent magnet and electromagnet get combined?
I mean to say superposition will be applied?
- 11
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2
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118
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Difference between electromotive force and back electromotive force
I'm wondering what is the difference between electromotive force EMG and back electromotive force BEMG.
I tried to answer in the following way by using two examples. but I'm not sure about the ...
- 297
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Have there been any experiments in which the Earth's electromagnetic field was used to do work?
Simply speaking using faraday's law to generate electricity with the use of earth's magnetic field.
I'm not talking about some revolutionary new way of generating electricity that would end our energy ...
- 121
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172
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Why armature is being rotated in DC generator?
I am wondering about why armatures are being rotated instead of being static?
The magnetic flux will still cut the armature windings and because of this induced current will be generated.
So, why it ...
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292
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How to identify north pole of a magnet using only a battery, and a copper wire? [closed]
I have a magnet, a copper wire, and a battery. I need to find the north pole, and the south pole of a magnet using only these items. (not a compass).
Here's my attempt: create a circuit, battery is ...
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A doubt about the topic of motional emf from Griffiths
Consider a closed rectangular loop of wire, which is moved to the right with a velocity ${\vec v}$ w.r.t a magnet that provides a static, uniform magnetic field $\vec B=-B\hat{z}$ over a region as ...
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110
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Metal/good conductor frame in a changing magnetic field
Imagine that we put a metal/good conductor frame into a changing magnetic field. Due to the fact that this is an electromagnetic induction phenomenon, an induced EMF can be measured between the two ...
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Force on a charged particle due to varying magnetic field [closed]
Magnetic field in a cylindrical region is varying as B = kt/r, ('k' is a positive constant, 't' is time and 'r' is distance from the center). B is directed upwards perpendicular to the cylindrical ...
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5
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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
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2
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134
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Radio Waves and the Lorentz Force?
Is the Lorentz Force involved when the EM wave intersects the receiving antenna? I.e. induces EMF on electrons in the antenna conductor?
I use the RHR with index finger $\vec v$ pointing in the ...
- 245
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81
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Faraday Induction Experiment question
I’m trying to understand the basic physical laws applying to Faraday’s induction experiment as pictured below. The Wikipedia site doesn’t go into detail.
When the smaller diameter inductor is inserted ...
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2
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641
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INDUCTANCE depends on the number of turns in a solenoid. Is this the case with RELUCTANCE as well?
The total flux ($\Phi$ ) through an solenoidal inductor of length $l$ and $N$ turns is proportional to the current through the inductor and the inductance $L$ of the inductor according to
$$\Phi =L \...
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257
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Is the induced electric field in a current changing solenoid actually that what we call magnetic vector potential field?
Induced electric field $E$ in a changing current (i.e. changing magnetic field $B$) solenoid
image creditis: https://faculty.uml.edu//Andriy_Danylov/Teaching/documents/L18Ch33InducedEcovered.pdf
I was ...
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How to reduce magnetic field between two magnetic shield sheets (silicon steel sheets)?
I put 2 parallel silicon steel sheets between magnetic field as below:
As silicon steel has much bigger permeability than air,magnetic line will go through 2 silicon steel sheets.
What I can do to ...
- 127
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Modeling the Effect of Magnetic Induction on Single Neurons
In this paper, the authors suggest a potential mechanism for magnetoreception in birds: as the Earth's magnetic field (taken to be homogeneous over sufficiently small spatial scales) passes through ...
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