All Questions
Tagged with electromagnetic-induction magnetic-fields
513
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With induced voltage, what is the electric potential difference?
Lets say we have a closed circular loop of wire in a constant magnetic field in the (-z) direction. If I suddenly make the circular loop smaller (meaning a smaller surface area), I will induce a ...
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How to calculate the Force between a magnet & an induced dipole? [closed]
https://www.youtube.com/watch?v=xTwDZJG_W9w
In this video at 9:12 it details the potential energy of an induced dipole
Specifically
$$U=-mBcos\theta=(\frac{\chi V}{\mu_0}B)Bcos\theta$$
&
$$F_z=\...
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Does the electric field ($E$ caused by induction) of a moving conductor in a magnetic field drop when connected to a curcuit?
We know that when a conductor moves in a homogenous magnetic field that is perpendicular to itself due to the amount of electric charge gathered on one end of the conductor( as a result of the lorentz ...
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What is the difference between paramagnetic and ferromagnetic?
What is the difference between paramagnetism and ferromagnetism?
Before answering, I want to note my difference between the rest of the similar questions on this website: from what I think I know, ...
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Back emf for simple DC motor in radial magnetic field
With a basic DC motor setup of a single coil spinning in a linear magnetic field, the back emf produced is a sin wave, as the change in the angle between the plane of the coil and the magnetic field ...
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Magnetic field outside an infinite solenoid carrying time varying current
I know that this short of question has already been asked a fair amount of time, but I could not find one matching the details I am looking for.
Consider we have an infinitely long solenoid. It is ...
2
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2
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165
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Energy Conservation when two permanent magnets attract each other
I have a very basic doubt related to energy conservation in a system of magnets. Suppose I have two magnets (bar magnets) of magnetic moment $M$ kept along the line with an initial distance $X_0$ such ...
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Why the magnet travels through solenoid faster if we connect a bulb to a solenoid
When a magnet travels linearly through a solenoid at a fast enough velocity if the ends of solenoid are connected to each other, the induced EMF generated and Lenz Law the solenoid opposes the motion ...
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How Mars have so less magnetic field if it spins?
Moving charges have magnetic fields. If Mars spins, it moves and so the core with it and so will the electrons inside it. Then why it needs liquid core to have strong magnetic field, what about the ...
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How do I find the BH curve from the frequency-complex permeability relationship?
I come here after a lot (I mean a lot) of research about complex permeability. I have a ferrite datasheet which give the complex permeability ($\mu'$ and $\mu''$) over frequency. I don't know how to ...
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Magnetic Field Produced by Solenoid
I was reading about solenoids and came to know that the magnetic field strength of a solenoid is greatly increased by
Increasing the number of turns in the solenoid coil (directly proportional to ...
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Using KVL in a changing magnetic field
I've asked a question before which was ''The proof of KVL,'' and the answer was if that we are dealing with electrostatic field then it's conservative field, and the closed line integral is equal to ...
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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 ...
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Calculating Induced EMF in Wireless LED Circuit
I have built the following circuit to power a wireless LED and my calculations and measurements do not give the same values. I am measuring a voltage nearly 6 times larger than I would expect in my ...
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What area should be chosen for finding EMF induced when only magnetic field $B$ is changing?
Suppose i have a region with uniform magnetic field which is changing with time.
For finding EMF induced in a conductor, we use $\frac{d\phi}{dt}$, where $\phi=B.A$ (as $B$ is uniform).
$$\implies EMF ...
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