All Questions
Tagged with newtonian-gravity electromagnetism
73
questions
5
votes
1
answer
301
views
EM 4-potential vs gravity 4-potential?
In classical field theory, the electrostatic and gravitational fields have very similar differential forms:
$$\vec \nabla\cdot \vec{E}=\frac{\rho}{\varepsilon_0}$$
$$\vec \nabla\cdot \vec{g}=-4\pi G\...
- 1,629
0
votes
1
answer
40
views
Dual of Newtonian gravitational field
In the static state, the laws of Newtonian gravity and Coulomb force have exactly same formulas,
$$F = K \frac{A_1A_2}{r^2}.$$
In the electrical case, moving materials produce a field, say a dual ...
- 1,409
10
votes
2
answers
1k
views
Multipole expansion of gravitational field
Just as in electrostatics we can expand in a Taylor series the electrostatic potential as the infinite sum of the contributions of a monopole, a dipole, a quadrupole, etc., could we apply the same ...
- 1,629
3
votes
1
answer
565
views
How close was Maxwell to general relativity? [closed]
In a recent paper by Accolierastro's recent video, she goes back to Maxwells seminal paper on electromagnetism, and the section on gravity. In Maxwells paper, he notes the similarity between the lines ...
- 39
1
vote
3
answers
122
views
Cavendish experiment and electromagnetism
Flat Earther's deny the Cavendish experiment at all costs, and it's useless to debate with them, but I learn a lot by watching the nonsense they talk about and studying it. They say that the masses ...
- 31
-3
votes
3
answers
308
views
Why do gravity and electricity sometimes obey inverse square laws over the same distance scale?
Is this a chance mathematical coincidence or is there a good physical explanation for it?
user381695
5
votes
3
answers
585
views
Two balls are dropped from the same height. Ball A is metallic and B, made up of an insulating material. Which of them touches ground first? [closed]
General motion under gravity states that both of them reach the ground simultaneously. But here, ball B reaches first. I searched for the solution but couldn't find any. Does it have anything to do ...
- 61
0
votes
1
answer
34
views
Would it be possible for a cylindrical magnet suspended vertically down from a hanging magnet to levitate in static equilibrium?
Let's assume that a cylindrical magnet is clamped by an horizontal arm extending out of the wall. The top of the magnet is its north pole and the smooth face facing down is its south pole. If I bring ...
- 15
0
votes
1
answer
78
views
Atoms in the cavendish torsion balance
Some people who try to deny the Cavendish Experiment say that the masses attract each other because of the atoms, not gravity. Doesn't an atom have a null electric field by nature? Is there any other ...
- 31
0
votes
0
answers
56
views
Poincaré inverse square law unification
A while back, I came across a claim that was something like this: Poincaré said that no two fundamental force laws could have the same mathematical form such as $1/R^2$; that no two fundamental force ...
- 1
0
votes
0
answers
100
views
Is fundamentally, gravity being much weaker than electromagnetism a myth? [duplicate]
I came across these two, conflicting conclusions information sources comparing at the quantum-scale distances (e.g. distance between two protons) the strength of Gravity Vs. Electromagnetism.
I ...
- 4,170
-3
votes
3
answers
113
views
How can the unit of Newtons measure both gravity and electromagnetism?
For context, I was thinking about forces. Force is the mass of the particle multiplied by the acceleration it undergoes. There are different kinds of forces, for example, gravity and electromagnetism. ...
- 161
0
votes
3
answers
128
views
Where is energy for work performed by unpowered objects coming from?
Let's consider two simple effects for which equivalent everyday examples are easy to find:
A helium balloon lifts a piece of rock from the ground into the air.
A permanent magnet lifts a nail off ...
- 129
0
votes
0
answers
30
views
Does Diamagnetism actually lessen G forces?
Example: Astronauts are pinned to their seats by 3gs during takeoff. If there were a sufficiently strong diamagnetic field, would the g-forces felt by the astronauts be lessened, or would they simply ...
- 719
3
votes
2
answers
189
views
Why isn't electromagnetism incompatible with special relativity?
The notion that newtonian gravity is incompatible with special relativity is often suggested by declaring the familiar equation $$F_g=\frac{Gm_1m_2}{|\vec{r}_1(t)-\vec{r}_2(t)|^2}$$ and stating that ...
- 103