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square current loop

 
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Nov17-07, 12:15 PM   #1
 

square current loop

how could a current in a square loop has a vector potential be zero due to 2 sides only.
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Nov17-07, 12:41 PM   #2
 
I believe the vector potential is zero in the center of loop only.
Nov17-07, 01:03 PM   #3
 
do you mean at the center the vector is zero inside the loop. or only for two sides that are parallel to the x axis.
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