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[Phys-L] Re: Area vector

Parallel to the plane is not unique; can point in any 2-D direction within the plane or tangent to the surface. Perpendicular defines the plane or surface; all you have to worry about is whether it points in or out.



Richard E. Swanson, Ph.D.
Dean of Instruction
Physics Professor
Sandhills Community College, Pinehurst, NC 28374 (910) 695-3715

wayne@PEN.K12.VA.US 03/29/05 2:27 PM >>>
Does any one know why the "area vector" for a surface is defined as
being normal to the plane of the surface instead of parallel to the
plane of the surface?
= = = = = = = = = = = = = = = = = = = = =
Tony Wayne
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