A charged particle moving perpendicular to a magnetic field has a magnet force on it.But when an observer moves with the particle,so that the particle has a relative velocity of zero with respect to the observer,one would expect there would be no magnetic force.Yet there is still a force.If it is not a magnetic force,then what is the source of this force?
A)It is an electrical force.
B)It is due to the ether.
C)It is a gravitational force.
D)It is something other than any of the above.

Question

Quizplus · Accepted Answer

The force observed by the stationary observer is due to the electric field created by the charged particle, which is not cancelled out by the magnetic force in this particular frame of reference. This is known as the electric field transformation. So, the force is essentially an electrical force.

A Charged Particle Moving Perpendicular to a Magnetic Field Has