Square Wires

Thread Starter

f74bat

Joined Nov 26, 2008
13
our long, straight wires are parallel to each other and their cross-section forms a square. Each side of the square measures 0.0112 m.




If each wire carries a currrent of 8.33 A in the direction shown, find the magnitude of the total magnetic field at P, the center of the square.


For this question I tried using B=(mu*I)/(2*pi*d) and multiplying the answer by 4 cuz there are 4 sides but my answer is not correct.
 

mik3

Joined Feb 4, 2008
4,846
You have to assume a positive direction of current flow. Say the dot is the positive direction and the cross is the negative direction. Thus find B each wire causes at point P and then add them together. According to, the assumptions, the right-bottom wire will give a negative B and the other wires positive B.
 
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