All Questions
Tagged with electromagnetic-induction electric-fields
136
questions
2
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3
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Closed loop integral of Electric Field dotted with dL
I am struggling to wrap my head around Faraday's law:
$$\oint\mathbf{E}\cdot d\mathbf{l}
=-\frac{d\Phi}{dt}
= -\frac{d}{dt}\int_S\mathbf{B}\cdot d\mathbf{S}$$
Integral of an Electric field dotted ...
- 29
6
votes
3
answers
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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_{\...
0
votes
1
answer
288
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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 ...
4
votes
2
answers
186
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Electric potential vs electromagnetic potential questions
We were all taught about the electric potential $V$, which is defined up to a constant, and can be measured with a voltmeter or an oscilloscope.
On the other hand, in electromagnetism are defined the ...
- 487
0
votes
1
answer
256
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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
0
votes
2
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84
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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
0
votes
1
answer
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
vote
3
answers
509
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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 ...
0
votes
5
answers
509
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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
votes
1
answer
262
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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
0
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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
0
votes
1
answer
140
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Current through grounded conductor in uniform electric field
I want to know that, if we place a conductor inside of uniform external electric field then opposite charges will get induced on the both sides of conductor, so what if we connect two earth wire to ...
- 33
0
votes
2
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150
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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
5
votes
5
answers
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Where does the energy stored in inductor go on opening the switch?
Suppose we have a simple RL circuit. At $t=0$, I close the switch so that current starts flowing in the circuit. When the steady state is achieved, current $i=\frac{\epsilon}{R}$ would be flowing in ...
- 123
0
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3
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Confusion regarding charge on capacitors
While I was studying about capacitors I realized that charge on the outer surface of the plates is zero when both the plates are given equal and opposite charges. Now mathematically, this realization ...
- 21