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I remember a TPR question asking about what a magnetic force can do and it said that the magnetic force cannot change the speed of a particle? Is this true? I don't understand how that can be true since any force (or net force) can cause an acceleration, which can change the speed of a particle? I know the answers said something like the magnetic force can be generated by a moving charge, can accelerate a moving charge, and can exert a force on a moving charge, but not change the magnitude of the speed of the charge (only change its direction)? Why?