All Questions
Tagged with electromagnetic-induction magnetic-fields
514
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Is there any way to detect localized magnetic field change in a magnetic material or powdered magnetic material?
Hi I was wondering if there was any way to detect localized magnetic field change within either bulk magnetic material or within like powdered magnetic material. The application we are looking for is ...
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4
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2
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137
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Faraday's law and a moving charge
Suppose we have a moving point charge with respect to some conductor which has a shape of a closed loop (e.g. a loop of wire). From the conductor's point of view the moving charge has a magnetic field ...
- 39k
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Faraday's Law - When do we know when it is a motional EMF or an induced electric field?
So from what I know, Faraday's law states that when there is a change in magnetic flux, an EMF is induced.
This can be explained with motional EMF where when the magnet moves towards the conducting ...
- 39k
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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 ...
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97
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When a magnetic ball passes through a copper pipe vertically
Let's say a magnetic ball passes through a hollow pipe, which is a conductor (copper), vertically. We can observe that its acceleration is decreased when compared to a free gravitational fall.
By ...
- 97.9k
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299
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Voltage across rod in time varying magnetic field
If a slim conductor of some length $l$ and diameter $d\ll l$ is placed in a magnetic field $B$, and the field is changed by $\frac {dB}{dt}$, what (if any) is the voltage $V$ induced across the ends ...
- 36.1k
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110
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How current is induced when there is a change in external magnetic field?
If still charges in a wire loop do not respond to a(or have their own) magnetic field, then how is current is generated by changing a magnetic field? And why only a changing magnetic field? What ...
- 10.6k
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Explaining Faraday's Law With Lorentz Transformations of $E$ and $B$ Fields
I've searched around for this but haven't come across a totally satisfying explanation yet. I'm trying to build a relatively simple model of how the Lorentz Transformations of the $E$ and $B$ fields ...
- 13.1k
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2
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87
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How does $ \vec{B}$ change when flux surface $A$ gets smaller?
So I am still a student and I just learned the basics of flux. And my teacher told us that flux ($\phi$) is equal to the magnetic field $B$ $\times$ the area $A$ $\times$ the angle of the area $\cos{\...
- 36.1k
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Intuition behind self-inductance
I'm having a little bit of a hard time understanding some concepts to do with self-inductance in class.
I understand mutual inductance. That's when a loop has some time-dependent current going through ...
- 13.1k
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General Question about Faraday Disk and a Loop
If we have a constant magnetic field, $B$, perpendicular to a rotating metal disk (essentially Faradays's disk), with some angular frequency, $f$ . Then there will be an emf across the ends of the ...
CommunityBot
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Getting the force somehow using magneticfield force (tesla)
First off, sorry if not everything makes sense, english isn't my first language so some scientific terms may sound weird if they're in English. For a project we are making a coil gun. So we get a ...
- 375
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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 ...
- 207k
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Induced voltage from magnetic field
Suppose we have a surface S(x,y) = x^2-2y for 0<x<2,0<y<5 , and a magnetic field (2t,3t+1,t).
To find the total magnetic flux through the surface S we find a normal vector to S n = (-Sx,-...
CommunityBot
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3
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3
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Motional EMF and Faraday's law in this case
My textbook states that when a straight conductor with a velocity perpendicular to itself and the magnetic field (see image), an emf will be induced between the two ends of a conductor. This means ...
- 207k