All Questions
12
questions
-1
votes
2
answers
76
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When is minimum potential energy in simple harmonic motion not zero?
We know that in simple harmonic motion, potential energy is minimum at the mean position and it is zero since displacement is zero. So what are some cases in which minimum potential energy is not zero?...
- 91
0
votes
1
answer
124
views
Violation of energy conservation due to Lorentz Force?
We know that work done by Lorentz Force $q(\vec{v}\times\vec{B})$ is $0$ on moving charge in magnetic field as velocity is always perpendicular to the force. This means that kinetic energy remains ...
- 1,168
1
vote
1
answer
76
views
Is a chemical gradient part of the grand potential energy?
Recently I was trying to write an intuitive explanation of entropy, and wanted to check my understanding of a simple system is accurate. Here we have a box with two sides:
Starting off, there is a ...
- 309
0
votes
1
answer
207
views
How to Derive Potential Momentum?
The only derivation/definition of potential momentum I've seen is using the fact that:
$$E^2-p^2c^2=m^2c^4$$
And if you add a potential, you must subtract something else from the momentum called the ...
- 11
0
votes
0
answers
109
views
Potential Energy of a System of Point Charges
Is the potential energy of an isolated system of point charges placed in a bounded space in equilibrium necessarily zero?
1
vote
3
answers
1k
views
Why is there a 1/2 in the expression for electrostatic energy U?
The expression for electrostatic energy is $$U= \dfrac{1}{2} \times \int \rho\,\phi\, dV$$ where $\rho$ is the charge density and $\phi$ is the potential at that point in ($dV$)
Let me explain what I ...
- 455
-1
votes
1
answer
71
views
How can negative total energy mean a bound state is potential zero is arbitrary?
My Understanding is that if the Hamiltonian (H) plus potential (V) of a particle if negative than we have a bound state. However I also know that a potential is defined by placing a zero at an ...
- 41
1
vote
2
answers
2k
views
Gravitational Potential Energy and Zero Points
I have two questions.
1) The first one has to do with the formula for deriving Gravitational Potential Energy. I learned that, for the derivation of Gravitational Potential Energy given large ...
- 3,200
0
votes
0
answers
61
views
Why is the potential electrical energy defined as the negative of the work integral, using couloumbs law to represent the force?
I saw many questions formulated more or less with the same words, but what I am not understanding here is different.
The Coulomb law describe a force in a charge by others charges in the environment, ...
- 157
12
votes
3
answers
152k
views
How does one prove that Energy = Voltage x Charge?
We know
$$E = q V$$
where $E$ is the energy (in Joules), $V$ is the potential difference (in Volts), and $q$ is the charge. Why is this equation true and how we prove it?
- 829
-5
votes
2
answers
4k
views
Is electron volt an alternate unit for electric potential? [closed]
My question is: Can an electron volt be considered an alternate unit for electric potential?
- 11
0
votes
2
answers
375
views
Elastic potential
I have a doubt:
elastic potential energy is given by: $U=\frac{k}{2}x^2+K$
but does elastic potential exist? (for example: potential gravitational energy is given by $U=mgz+K$ and gravitational ...
- 1,133