All Questions
Tagged with electric-fields energy
100
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Experiment for generating electricity from high heated and pressurized gas [closed]
Experiment for generating electricity from high heated and pressurized gas.
While playing ball at school, many of us had the experience about feeling the energy from the ball hitting it upon the ...
- 103
2
votes
1
answer
55
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Does making a magnet move require more energy than a non-magnet?
I know that electric fields store energy, with their energy in an infinetesimal volume being proportional to $E^2$ at that point. I also know that a moving magnet creates an electric field (...
- 531
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17
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Time average of product of 2 function with same frequency
Hi I'm Reading a notebook on "light atom interactions"
There is this calculation I don't understand of average power -
$$P=\overline{-\boldsymbol{E} \cdot \frac{\mathrm{d} D}{\mathrm{~d} t}}=...
9
votes
1
answer
934
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For a charged hollow sphere: why is the energy calculated from the electric field different to its total energy?
I'll first calculate from its electric field, the energy of a charged hollow sphere of radius R carrying charge $Q$. I'll then show that this is different to calculating the total energy directly from ...
- 3,108
4
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58
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Energy in electric field of an electron?
I am just trying to get an intuition for the Griffiths equation no. 2.45, where work done to establish a field E is given by
Say we want to solve it for electric field due to an electron (point-charge)...
4
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3
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164
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Origination of electromagnetic wave energy
Please correct me if I am wrong in my statements
While it is said that electromagnetic waves are formed by the oscillation (acceleration) of charges which forms 'kinks' in their electric field which ...
- 87
1
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0
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31
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Infinite energy from net charge of a closed, finite universe
I have read that a net charge in a closed, finite universe would result in the electric field from the charge "winding" forever which would lead to infinite energy. However, wouldn't the ...
- 38
1
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1
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295
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Why energy eigenvalues of a one dimensional quantum charged harmonic oscillator in an external electric field decreases? [duplicate]
Consider a charged particle in the one-dimensional harmonic oscillator potential. Suppose an electric field of magnitude $E$ is applied along positive $x$ axis, so that the potential energy is shifted ...
- 333
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2
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286
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Shouldn't the electric potential energy decrease with separation regardless of whether the charges are positive or negative?
I was revising Electric Fields and it came up that if a positive charge moves in the direction of the electric field (so away from a positive charge), then the electric potential energy will decrease ...
0
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54
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Energy in electric field calculated in two different ways
The equation for the energy density in a region of space where there is electric field, $\epsilon_0E^2/2$ implies that energy in the electric field can only be positive. Consider, however, the energy ...
- 49
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101
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Is $∫ (1/2)εE^2 dV$ in the entire volume of rays propagation $= nhf$? [closed]
I asked it on ChatGPT but it gave kind of a mixed answer contradicting itself in the process several times here is some of it.
"Kushagra Singh:
~so you mean $∫ (1/2)εE^2 dV$ in the entire volume ...
- 19
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51
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Electric field energy deduce, why one of the term goes zero?
When we derive equation for energy of electric field, we end up below during the process
$$U=\frac{\epsilon_0}{2}\left[\int (\nabla\phi)\cdot(\nabla\phi)dV-\int\nabla\cdot(\phi\nabla\phi)dV\right]$$
...
0
votes
2
answers
130
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Electric field and conservation of energy [closed]
I have a question of conservation of energy. Let's say I have two charged plates, one positively charged and the other negatively charged. Both have a hole and an electric field exists between the two ...
1
vote
1
answer
151
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Does a spherical capacitor hold as much energy as a spherical shell?
Consider a spherical capacitor, that is, two concentrical spherical shells which serve as plates. Suppose the capacitor is charged. It is my understanding that the energy stored by a capacitor is ...
2
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1
answer
429
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Energy, dielectrics and microscopic electric fields
Let us assume all electric fields are microscopic (just to be clear I have no idea what this word means here and is one of the questions addressed below, I am just using it here because it makes the ...
