hellfire said:Accelerated charges emit radiation. Due to the equivalence principle there is no difference between an accelerated frame and a frame inside a gravitational field. But we do not experience any radiation from charges inside the gravitational field of earth. Why?
hellfire said:Ok, I went through that chapter. My understanding: the charge at rest on Earth does not radiate because of the global static behaviour of the field lines according Larmor's effect. This does not contradict the equivalence principle because it aplies only for local experiments and no global frame is definable in this case. Is this correct?
hellfire said:Now I am confused. Do you claim that the radiation emitted by accelerated charges is an observer-dependent phenomenon? If yes, it seams to me that this is in contradiction with the reference DW gave us.
As far as I understood, there the norm of the four-acceleration is used in the Larmor formula, which makes the radiated power invariant (refer to eq. 7.2.3).
So, what kind of acceleration is the one to be used in the Larmor formula? Furthermore, what is the validity of this formula?
Regards.
In physics, mass refers to the amount of matter present in an object, while weight is a measure of the force exerted on an object due to gravity. In a gravitational field, an object's mass remains constant, while its weight may vary depending on the strength of the gravitational field.
The value of gravitational acceleration, denoted as 'g', determines the strength of the gravitational field. In a uniform gravitational field, the force experienced by a charge due to gravity is directly proportional to the charge's mass and the value of g. Therefore, a higher value of g will result in a greater force of attraction or repulsion on charges in a gravitational field.
Yes, charges can be shielded from the effects of a gravitational field. This is known as the Faraday cage effect, where a conductive material can block the electric field inside it. In the same way, a conductive material can shield charges from the effects of a gravitational field, as gravity and electric fields are both fundamental interactions.
The direction of a gravitational field determines the direction of the force exerted on a charge. A charge will experience a force of attraction towards a more massive object, and a force of repulsion towards a less massive object. The direction of the force is always towards the center of mass of the object creating the gravitational field.
Gravitational potential energy is the energy possessed by a charge in a gravitational field due to its position. It is directly proportional to the mass of the charge, the strength of the gravitational field, and the height at which the charge is located. As the charge moves closer to a massive object, its gravitational potential energy decreases, and vice versa.