The discussion revolves around a physics exam question concerning the behavior of a charged particle in different fields: electric, magnetic, and gravitational. Participants explore the conditions under which no force acts on the particle, considering its state of motion and properties.
Participants express differing views on the conditions under which a charged particle experiences no force, with no consensus reached on the implications of mass and charge in the context of the fields discussed.
Participants acknowledge various assumptions regarding the mass and charge of the particle, as well as the potential neglect of relativistic effects and General Relativity, which remain unresolved.
Presumably you are intended to assume that say, the particle is massive and charged? If that is the case which of those forces would produce such motion.Ellie said:I got a question from my exam. We are given the name of three fields; electric field, magnetic field and gravitational field. A charged particle is placed in a field, but no force will act on it if it's stationary or moving in any direction. What field is the particle placed in?
Vagn said:Presumably you are intended to assume that say, the particle is massive and charged? If that is the case which of those forces would produce such motion.
my2cts said:If the particle is not massive there is no solution.
If it is the right combination of electric and a gravitational fields can do the job at rest.
When it moves, its energy increases by a factor 1/sqrt(1-v^2) but so does its charge.
So the solution is still valid.
The charge is a Lorentz invariant, and does not change with motion.my2cts said:When it moves, its energy increases by a factor 1/sqrt(1-v^2) but so does its charge.