All Questions
Tagged with gravity electrostatics
27
questions
0
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394
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Why doesn't the gravitational force have a permittivity in its formula? [duplicate]
We know that the electrostatic force between two charges depends on the medium between the charges and its permittivity. Why, then, doesn't the gravitational force depend on the medium?
-4
votes
1
answer
236
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In atoms which are more likely to attract first until they are together? Magnetism, gravity, electrostatic charge or other? [closed]
When do single atoms begin to pull together when they are close enough like 2 magnets?
Could 1 atom contain a magnetic field and would it be stronger than an atom's own gravity?
I know that atoms ...
- 1
-1
votes
1
answer
3k
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What is the difference between an electric field and gravitational field? [duplicate]
Since the electrostatic field and the Newtonian gravitational field share a similar form: proportional to
$$
\frac{1}{r^2}
$$
Is there any qualitative difference between motions under the ...
- 209
1
vote
1
answer
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Does Earth also move due to some electrostatic forces?
Does the earth experience some electrostatic forces due to other planets...which also make it move?
My question is..whether the earth also moves due to electrostatic force of attraction or only due ...
2
votes
3
answers
364
views
How come we talk about gravitational potential energy and not gravitational potential?
With regards to gravity the equation learned is $$U=-\frac{GMm}{r}$$
And the relationship to force is $$F=-\frac{dU}{dr}$$
In electrostatics we instead talk about electric field and electric ...
- 1,760
7
votes
1
answer
469
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How do aspherical gravitational monopoles look like?
I was recently pointed by laboussoleestmonpays to a beautiful paper from some time ago,
Aspherical gravitational monopoles. Alain Connes, Thibault Damour and Pierre Fayet. Nucl. Phys. B 490 no. 1-2 ...
- 134k
21
votes
2
answers
3k
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Is Newton's universal gravitational constant the inverse of permittivity of mass in vacuum?
Is it possible to consider Newton's universal gravitational constant, $G$, as inverse of vacuum permittivity of mass?
$$\epsilon_m=\frac {1}{4\pi G}$$
if so, then vacuum permeability of mass will be:...
user26425
3
votes
0
answers
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Modeling the formation of a stellar system and matter accretion
I am trying to figure out what do I need to know to properly simulate the creation of a solar system from a particle cloud with random distribution of hydrogen atoms.
Being more of a programming ...
- 131
6
votes
1
answer
7k
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Trying to understand Laplace's equation
I'm struggling here so please excuse if I'm writing nonsense.
I understand that the gravitational potential field, a scalar field, is given by $$\phi=\frac{-Gm}{r}$$
where $\phi$
is the ...
- 3,059
2
votes
2
answers
3k
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What is the effect of temperature on electrostatic-gravitational balance?
We have two identical massive metal spheres at the same temperature at rest in free space. Both have an identical charge and the Coulomb force [plus the black-body radiation pressure if the ...
- 478
10
votes
6
answers
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What prevents the accumulation of charge in a black hole?
What prevents a static black hole from accumulating more charge than its maximum? Is it just simple Coulomb repulsion?
Is the answer the same for rotating black holes?
Edit
What I understand from ...
- 1,261
5
votes
3
answers
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Paradoxical interaction between a massive charged sphere and a point charge
Suppose we have a sphere of radius $r$ and mass m and a negatively charged
test particle at distance d from its center, $d\gg r$. If the sphere is electrically neutral, the particle will fall toward ...
- 478