All Questions
10
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Motion of an electron in a magnetic and electric field [closed]
I have this problem where i should find the direction and magnitude of the electric and the magnetic force on the electron.
E = 1000 N/C B = 2,5 T v = 500 m/s
...
- 115
2
votes
2
answers
2k
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Finding net magnetic and electric force on charged particle [closed]
This is from my textbook, it is not an assigned problem, but I want to understand.
It says:
Consider the situation in the figure, in which there is a uniform electric field in the x direction ...
- 23
1
vote
2
answers
697
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Motion of charged particle in uniform magnetic field and a radially symmetric electric field
This question posted by me on MSE talks about a physics problem. This is what it was: (I hope someone can help me with this)
Consider a region of 2-dimensional space with a uniform magnetic field of ...
- 121
3
votes
1
answer
112
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Nabla commutation in electromagnetism
I don't know how to work with the 'reversed' dot product operator,
$$v\cdot \nabla$$
I arrived to expressions like this trough doing some calculus, and I don't know how to continue with the calculus ...
- 529
3
votes
1
answer
435
views
Heaviside-Feynman formula derivation
I want to discuss derivation of Feynman-Heaviside formula.
The topic has already been discussed here but I can not put there any question that's why I'm making new post.
Deriving Heaviside-Feynman ...
2
votes
1
answer
278
views
Why the Dielectric strength decrease with the frequency?
According to Wikipedia, the dielectric strength decrease with the frequency:
Is it possible to explain what is happening when the frequency increase ? I try to understand how to generate an arc ...
- 177
2
votes
1
answer
2k
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Potential due to a charged ring : Electric field discontinuity
I have just begun with my third year intermediate course in electrodynamics. A standard problem in electrostatics that one may repeatedly encounter is that of finding the potential due to a uniformly ...
- 380
1
vote
2
answers
4k
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How do I choose the right value of $r$ to find where the electric field is zero?
Sorry for the long question. I'm having a difficult time trying to explain my confusion.
I have a positive point charge$\ Q_1 =+q$ at the origin and a negative point charge $\ Q_2 = -2q$ at $\ x=2$
...
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0
votes
0
answers
81
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Why is $\vec E_{\text{Vacuum}}=\epsilon_{r}\cdot\vec E_{\text{Dielectric}}$?
Basically, I'm asking why the electric field in a vacuum (or the applied electric field) is related to the electric field in a dielectric by the relative permittivity $\epsilon_{r}$.
For context I'll ...
- 2,470
-2
votes
1
answer
18k
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Electric field due to nonconducting plastic sheets [closed]
Two very large, nonconducting plastic sheets, each 10.0 cm thick, carry uniform charge densities $\sigma_1, \sigma_2, \sigma_3$ and $\sigma_4$ on their surfaces (the four surfaces are in the following ...
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