# Does light attract charge? [duplicate]

Light is an electromagnetic wave, with an electromagnetic field. Does it attract/repel charge?

• Does this answer your question? Does a photon attract or repel matter? Jan 31, 2023 at 15:50
• @Mauricio, not really. I think it's too complex for me. But what you were writing as an answer did enlighten me (pun intended) somewhat. If an electromagnetic wave goes by a negative charged particle, I guess that it makes sense that it interacts with it, and this is the equivalent of absorbing a photon and emitting a less energetic one, right? Jan 31, 2023 at 15:59
• Light is the attraction and repulsion itself between charges. Jan 31, 2023 at 16:38

Example: Suppose that you have a source of coherent light and a positive charge fixed in space. Suppose that electric field is described by a sine wave in time with a given period such that it propagates in the $$x$$-direction and when the electric field is positive it applies a force to the charge up in the $$y$$-direction. At $$t=0$$ there is no electric field, after 1/4 of the period it applies a force to the charge up in the $$y$$-axis, after 1/2 period it does nothing again, after 3/4 of the period it applies a force down on the $$y$$-axis an so on.