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Light travels along the x-axis and strikes a stationary free electron. Its E field oscillates along the y-axis. The electron moves off at an angle with respect to the x-axis less than 90 degrees. By what mechanism does light cause this electron to have a component of motion along the x-axis?

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    $\begingroup$ Don't forget that light also has a magnetic field. $\endgroup$ – garyp Jun 12 at 1:17

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