Magnetic Field due to a current in a straight wire

Let’s now consider the magnetic field at some point (x) a distance a above a current, I, in a straight wire. We start with the Biot-Savart Law: B = (mo I /4p) ? dL sin(qIr) / r2.

By the RHR, the direction of B is out of the screen. x

r a

I

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