All Questions
Tagged with gravity electromagnetism
207
questions
7
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Can gravity radiate?
In electromagnetism, when a charge accelerates, it emits radiation. We know this because we can write the retarded potentials, apply $\vec E=- \nabla V-\frac{\partial \vec{A}}{\partial t}$ and $\vec B=...
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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 ...
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2
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Gravitational Constant with ENM Units?
To give some context, there's a conspiracy 'theory' that I saw called Electric Universe that says that gravity is not a fundamental force and instead is a "incoherent dielectric acceleration"...
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Why does the wavelength of gravitational waves increase with larger energy?
Gravitational and electromagnetic waves are quite similar, as both are fundamental force waves that travel at the speed of light and have no limit to their range, but when it comes to electromagnetism,...
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Does gravity affects electromagnetic waves? Or electromagnetism affects gravity?
I'm confused about the relationship of electromagnetism and gravity, or are they even related?
It has been said the electromagnetic field produces a gravitational field, and so, there is no gravity if ...
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Has anyone noticed that $G \times K\approx \frac{3}{5}$? [closed]
I have noticed that $$G \times K\approx \frac{3}{5}$$ Where $G$ is the universal gravitational constant and $K$ is Coulomb's constant.
Moreover, the approximation is so good that, taking into account ...
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"Space is a medium of gravity but not of electromagnetism"...how does this work?
It is undeniable that spacetime is medium for gravitational waves propagation as first confirmed by LIGO experiment having elasticity and compressability.
However, for electromagnetism space has the ...
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Why can this magnet hold more weight vertically?
I was browsing Amazon for magnetic hooks for my fridge and saw this diagram which surprised me because it is the opposite of what I would expect. Wouldn't the "Vertical" magnet be the ...
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Why doesn't the lack of electromagnetic repulsion between dark matter particles result in the formation of black holes? [duplicate]
From what I've researched dark matter isn't subject to electromagnetic forces, which I'm assuming implies that there is a lack of electromagnetic repulsion between dark matter particles.
If there's ...
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Maxwell's equations in curved spacetime not invariant under metric perturbation gauge transformations
Gauge transformation in general relativity
This post states that
$$h_{\mu\nu} \rightarrow h_{\mu\nu} + \partial_\mu \xi_\nu + \partial_\nu \xi_\mu \tag{1}$$
Is a gauge transformation for a spin-2 ...
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The Relation Between Maxwell's Equations and the Equations of Gravitoelectromagnetism
Under certain conditions, it is possible to approximate the effects of the theory of relativity through equations very similar to those of Maxwell, but for gravity. In these equations, our "...
12
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Weight of magnet depends on its N-S orientation?
I weighed a Neodymium disc magnet and found that it weighs about $1$ mg more when the north pole is upwards than when the south pole is upwards.
Can this be explained by "conventional" ...
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Do the other 3 fundamental forces also warp space-time?
I got this idea from Einstein's insight using the falling elevator. He says, that Gravity really cannot be distinguished from any other force accelerating the elevator.
A bunch of questions on here (...
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2
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Does a linearly accelerated observer inside an inertial spherical charged shell detect an electric field?
The electric field inside a charged spherical shell moving inertially is, per Gauss's law, zero.
If the spherical shell is accelerated, the field inside is not zero anymore, but it gains a non-null ...
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Magnet force vs gravity
I'm currently at work and the question of differences over the strength of gravity vs the strength of magnetism. Hypothetically if the sun was a giant neodymium magnet what affect would that have on ...
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Can Electromagnetism affect Gravity? [duplicate]
We know Gravity affects Electromagnetism when we see Black Holes bending the light around them. That makes me wonder if Electromagnetism Can Effect Gravity?
Just like how $E=mc^2$ means energy and ...
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Question on asymptotic flatness
What is the theoretical argument for the asymptotical flatness of the four-potential? Can one assume asymptotical flatness for the scalar dilaton field as well?
anon
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Is gravity of matter similar to temperature?
Apart of general relativity and the quantum theory postulate o gravitons I am looking for an alternative quantum physical interpretation of gravity of matter?
Watching this short video-cut from Dyson'...
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Gravitoelectromagnetism: How far does the analogy go?
In weak gravitaional fields, we can write equations analogous to the Maxwell equations: Gravitoelectromagnetism.
Do the gravitoelectric field and the gravitomagnetic field transform like components ...
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A wind tunnel and 2 strong magnets in the wind tunnel creating a very strong field, how would the wind & magnetic force interact?
Sorry if I get some terminologies wrong I am not a physics major :)
If I had a big wind tunnel on earth blowing wind through a strong magnetic field (so the opposite poles of 2 giant magnets creating ...
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EM field in a strong gravitational field
Imagine simple solenoid 10cm in length with given magnetic field in a gravitational field with a large gradient, for example the clock near one pole of the solenoid is running 1 second faster, meaning ...
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2
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Mutual gravitational acceleration (or deflection) of light beams as a function of the angle between them
Given Einstein's famous equivalence between energy and mass, $E=mc^2$, a light beam with power, $P$, has an energy per unit length of $P/c$ and an equivalent mass per unit length of $P/c^3$. A short ...
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How is the gravitoelectromagnetism approximation of GR valid if it seems to yield unstable solutions?
In the gravitoelectromagnetism approximation of GR, we have equations analogous to Maxwell's equations with some sign changes. As pointed out in another post of mine, this leads to unstable run-away ...
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If contact forces are repulsive then how are we able to pull stuff? [closed]
I searched a lot on internet(especially physics stackexchange) about the nature of contact forces. I came to know through most of them that it is repulsive in nature which surely means that your hand ...
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What is the gravitational pull of a photon? [duplicate]
I know it may seem like a stupid question, but I recently found out that because a photon has energy (obviously) then it must have a gravitational pull. I was wondering exactly what this gravitational ...
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Could gravity around rotating bodies make them pull apart rather than attract? Due to the gravitational field analogous to the magnetic field
In this video:
https://www.youtube.com/watch?v=rKFzV8sVDsA
Eugene explains that moving bodies generate two types of gravitational fields, the common one that attracts other bodies as we usually study ...
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2
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490
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New "gravity force" analogous to magnetic force?
I was watching Eugene Khutoryansky's physics video about Einstein's Gravito-Electromagnetism, Gravity of moving mass in General Relativity
. In that, he discussed why maxwell's electromagnetism laws ...
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The spin of a field
I have searched for an explanation for the math behind the spin of fields, such as the electromagnetic field has a spin of 1 and the gravitational field has a spin of 2.
The internet did not provide a ...
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Is it possible to make a magnetic box that will compensate Earth gravity allowing magnetic objects inside to fly on orbits like in space? [closed]
Is it possible to simulate solar system using magnetic spheres and some kind of box that will compensate the Earth gravity by magnetic force?
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Extent of verification of household-name physical concepts? [closed]
I was listening to some news coverage of the IPCC's newest report, which included a statement that "the evidence that climate change is real is now provided by over 14,000 studies worldwide."...
