All Questions
79
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Can ionized air be used as a conductive medium for eddy brakes?
Sort of a conceptual engineering question, apologies if I am missing something, my background is in mechanical engr.
Essentially, I was inspired by the classic experiment of dropping a magnet in a ...
0
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2
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78
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What type of electric field is created by time varying magnetic field?
Example when an current carrying loop is placed in external magnetic field varying with time some emf is produced in the coil now we know that emf is due to electric field and the loop is experiencing ...
6
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3
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1k
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Suspicious EMF equation
Some context: I am trying to get the equation of motion for a dipole magnet falling through copper pipe. To proceed I need to calculate the EMF. We can do this by using Faraday's law,
$$\oint_{\...
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1
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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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1
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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 ...
- 4,170
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2
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Is Farady's law valid for conducting loop only? [duplicate]
Is it applicable to a nonconductive loop? What if the loop consists of both non-conducting and conducting paths?
- 480
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233
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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,-...
- 105
1
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3
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512
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Nature of force between two permanent magnets
When we put two permanent magnets close to each other they repel or attract each other and this process increase their kinetic energy. I know that magnetic force can't increase kinetic energy so plz ...
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5
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512
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Total Energy of an electromagnetic wave
This question may sound stupid. But why when we calculate the total energy density (energy/volume), carried by an electromagnetic wave $u_T$, we add both $u_B$ + $u_E$.
Where $u_B = \frac{B^2}{2\mu_0}...
- 170
-1
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Electric field of moving charge
Does the electric field of a moving charge (constant velocity) change with time? Or it remains the same?
I know that changing electric fields produce a magnetic field, but in a straight, current-...
user324098
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2
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Electric field in a vacuum
By changing the magnetic field can we generate electric field in a vacuum ?
By the Faradays law of EMI if the magnetic field associated with a coil changes, current is induced in that coil
So if we ...
user324098
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2
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151
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Potential in electric field by magnetic induction
There is a point written in my book (S.L. Arora- Simplified Physics Part-1)-
Electric Potential is meaningful only for electric fields produced by stationary charges. It has no meaning for electric ...
- 13
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2
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591
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Doesn't Faraday's law violate conservation of energy?
Faraday's law says that if we have a changing magnetic field, there will also be an electric field (basically). I already know that both fields have energy. Is this energy given when accelerating the ...
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Why moving magnet releases more Magnetic radiation as the number of charges near it are increased?
Why does a moving (at constant velocity) magnet release more energy in the form of magnetic fields when the number of charges placed near it are increased?
Say two current carrying coils $C1$ and $C2$ ...
1
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1
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286
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Can electromagnetic field(EMF) meter used to detect electromagnetic pulse(EMP)?
In theory,can electromagnetic field(EMF) meter used to detect electromagnetic pulse(EMP)?
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