All Questions
Tagged with newtonian-gravity electromagnetism
18
questions
122
votes
10
answers
17k
views
How can I stand on the ground? EM or/and Pauli?
There is this famous example about the order difference between gravitational force and EM force. All the gravitational force of Earth is just countered by the electromagnetic force between the ...
- 1,321
43
votes
6
answers
8k
views
Why are so many forces explainable using inverse squares when space is three dimensional?
It seems paradoxical that the strength of so many phenomena (Newtonian gravity, Coulomb force) are calculable by the inverse square of distance.
However, since volume is determined by three ...
- 544
9
votes
3
answers
1k
views
Negative Mass and gravitation
Since Newtonian gravity is analogous to electrostatics shouldn't there be something called negative mass? Also, a moving charge generates electric field, but why doesn't a moving mass generate some ...
- 559
31
votes
8
answers
4k
views
What is potential energy truly?
I have a problematic question for which I have been unable to attain a satisfactory answer. What is potential energy truly?
-
I have read about how potential energy can be seen as the "highering" ...
- 881
10
votes
4
answers
14k
views
Similarity between the Coulomb force and Newton's gravitational force
Coulomb force and gravitational force has the same governing equation. So they should be same in nature. A moving electric charge creates magnetic field, so a moving mass should create some force ...
- 1,975
21
votes
2
answers
3k
views
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
16
votes
2
answers
8k
views
Why does electric force depend on the medium?
Comparing the equations for the gravitational force
$$\vec{F}_g=-\frac{Gm_1m_2}{r^2}\ \hat{r}$$
and the electric force
$$\vec{F}_e=\frac{Kq_1q_2}{r^2}\ \hat{r}$$
I noticed that the only major ...
- 1,758
4
votes
1
answer
3k
views
Gravity force strength in 1D, 2D, 3D and higher spatial dimensions
Let's say that we want to measure the gravity force in 1D, 2D, 3D and higher spatial dimensions.
Will we get the same force strength in the first 3 dimensions and then it will go up? How about if ...
- 75
8
votes
2
answers
583
views
Calculating the potential on a surface from the potential on another surface
The question is short: If a charge (or mass) distribution $\rho$ is enclosed by surface $S_1$, I can calculate the electrostatic (or gravitational) potential on that surface by integrating $\rho(r') \ ...
- 6,273
2
votes
3
answers
426
views
A broader view on contact forces
I am aware that all the contact forces we experience like tension, friction, normal reaction, et cetera are complex manifestations of the fundamental forces which are gravitational forces, ...
- 1,147
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
5
votes
3
answers
1k
views
Why does Newton's Third Law work for fields?
Newton's 3rd law goes like this: To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
I ...
- 892
4
votes
1
answer
388
views
Is there an Abraham-Lorentz force for Gravity?
The Abraham-Lorentz force in Electromagnetism is the recoil a charge experiences as it accelerates due to own emission of radiation.
The Newtonian theory of gravity is identical to that of ...
- 596
9
votes
5
answers
5k
views
Is gravity non-negligible compared to the electromagnetic force?
Consider two electrons approaching each other at rather fast speeds, maybe even coming close to colliding. Does gravity play any role in this event? If so, how much influence does it have? Do we need ...
9
votes
2
answers
658
views
What is the condition for accelerating charge to radiate?
I was always taught that any accelerating charge produces radiation, but I don't think this condition is sufficient condition. For instance, any free charge on Earth is accelerated due to Earth ...
- 123