A particle with negative charge -q and mass m moves inside a uniform magnetic field B, where the direction of B is out of the paper. The speed of the particle is v and, at a certain time, the particle moves along the direction of the red arrow. (a) Explain what kind of motion the particle have. You need to explain your reasoning with a few sentences. (b) Starting from Newton's second law, show that the trajectory of the particle obeys В r = qB

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.