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Homework Statement
A conductor in the shape of a square of edge length 0.28 m carries a current I = 17.0A. Calculate the magnitude of the magnetic field at the center of the square. Round your answer to three significant figures. Take the permeability of free space to be 4*pi*10^-7.
Homework Equations
L = length of one side of the square = 0.28 m
I = current = 17 A
Sin(theta2) = 45 degrees = sqrt(2)/2
Sin(theta1) = -45 degrees = -sqrt(2)/2
B = 4{[(mu*I)/(4*pi*L)] * (sin(theta2) - sin(theta1))}
The Attempt at a Solution
I think I've got it, but the website won't take my answer. Sorry for the lack of LaTex.
Values for theta were obtained by forming two 45-45-90 triangles; those values are the distance from any side to the center.
Plugging everything in, I get 4{[(4piE-7*17) / (4*pi*0.28)] * sqrt(2)} = 34.3 * 10^-6 T. However, this is incorrect. Have I made a calculation error? A concept error? This will be my 23rd try putting something into the website and I am tired of it.
Thanks for any help.