How the Biot-Savart Law Differs from Ampère's Law A current Io flows up the z-axis from z = 31 z = z2 as shown below. Z2 (a) Use the Biot-Savart law to show that the magnetic field in the z = 0 plane is Ho lo {cos 02 – cos 0,} $. 4л р В(о, ф, 0) —
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