Tue May 29, 2012 By: Mahesh Meghwal

Sir/Madam I wanna know that how the angle becomes "0" degrees; when electric field lines passes through a given surface (given in the image). I think it should be "90" degrees!

Expert Reply
Tue May 29, 2012
Electric field lines are passing through the surface means that they are passing parallel to the surface and not perpendicular to the surface. Therefore the angle becomes 0 degree.
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