Magnets at the speed of light. I guess that if you propel a (natural) magnet close to the speed of light then nothing unusual happens to the magnetic field because it already exists and is accelerated along with the magnet, but what happens to an electro magnet? If an electro magnet is traveling at 99.9999999999% the speed of light and you turn it on does the magnetic field stick to the surface in the direction of travel and radiate normally behind? The reason I ask this is because for the magnetic field to move forwards it would have to travel faster than the speed of light. (would it be a monopole?) Rotating spheres (at the speed of light) *NOTE to keep things simple I have reduced the speed of light to just 1,000 meters a second and I have a ball (made of anything you like) with a circumference of exactly 1 meter, if I rotate the ball at 1,000 revolutions per second the surface of the ball (in the direction of the spin) will be traveling at exactly the speed of light. Ok now the question. If I spin my ball to 500 RPS will it have a maximum speed of 500 MPS in the direction of the spin? is the rotational speed added to the forward motion? Or to put it another way, if my ball is traveling forwards at 950 MPS and it was spinning at 100 RPS in the direction of travel would it break the laws of physics because the surface of the ball was traveling faster than the speed of light (if you add the forward motion and the spin together) An odd property of a ball like that spinning at 1,000 RPS would mean it would be impossible to move it in any direction (not just the direction of spin) kind of like an anchor in space.