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Hi

I am looking at four parallel wires of finite length L, whose currents run in the directions shown in the attached figure. There is no gradient along the wire-axis, so from Maxwell's equation

[tex]

\frac{dB_x}{dx} = -\frac{dB_y}{dy} \equiv \tilde B.

[/tex]

How would I go about finding an expression for the gradient [itex]\tilde B[/itex] given some current I though the wires? This isn't a homework question, I have just not been able to find the answer anywhere.

Best,

Niles.

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# Homework Help: Magnetic field from four wires

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