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Relativistic electromagnetism and electromagnetic forces on 2 protons

The question I have about it is how we can get the same result of net force acting on the individual protons if we judge the system from 2 different reference frames. One using more of the magnetic ...
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Is Magnetic force really the relativistic correction for electrostatic force?

Imagine two charges (aligned vertically) with a separation $r$ in a spaceship moving with a velocity $v$ with respect to earth. In the spaceship frame, the charges are stationary with a force F′=\...