A charge can't feel its own field

A charge can't feel its own field - A charge cannot feel a...

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A charge cannot feel a force from its own electric field. That's easy enough to say, but somtimes it can be confusing to figure out which electric fields to keep and which to ignore. To find out what force the small charge feels, you would use F = q E , with q = small charge and E = electric field from all other charges. You should completely ignore the light green field lines above. Of course, if the problem had asked about the force on (or motion of) the negative charge, you would make a different choice of what to ignore. Your treatment depends on what is asked, not just on what the charge arrangement is. Suppose that you have a homework problem involving the picture to the right with three charges (red is positive, blue is negative). Also shown is the electric field from each of the charges. It is important to note that. .. At this point, you cannot tell which fields you will need to include in the problem! You need more information.
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A charge can't feel its own field - A charge cannot feel a...

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