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erinec
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Homework Statement
http://img291.imageshack.us/img291/9572/picture2ehv.png
What is the strength of the magnetic field at point P?
The answer is 7.9×10^−5 T.
However, I used the equation B = u*I/(2*pi*d) and keep getting 5*10^-5 T.
Homework Equations
B = u*I / (2*pi*d)
The Attempt at a Solution
Nearer wire:
B = uI/(2*pi*d) = (1.257*10^-6)(5.0)/(2*pi*0.02) = 0.00005 T
Further wire:
B = uI/(2*pi*d) = (1.257*10^-6)(5.0)/(2*pi*0.01) = 0.0001 T
Total B:
B = 0.0001T - 0.00005T = 0.00005 T
What am I doing wrong?
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