[1] Two identical particles with mass m and electric charge q tied to strings of length L are hung as in figure. What is the distance r between two particles which are separated by the L. electric force? We may assume tan0 = sin0 because 0 < 1. m, q

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.