PHY2061 R. D. Field Department of Physics chp33_1.doc University of Florida The Magnetic Field Produced by a Current The Law of Biot-Savart: The magnetic field at the point Pdue to a charge dQmoving with speed Vwithin a wire carrying a current Iis given by dBKdQcrVrrr=×22$where K = 8.99x109Nm2/C2and c = 3x108m/s(speed of light in a vacuum). However, we know thatI = dQ/dtand rrVdldt=so that dQVIdlrr=and, kIrrrr2$(Law of Biot-Savart), where k = K/c2 = 10-7Tm/A
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This note was uploaded on 05/31/2011 for the course PHY 2061 taught by Professor Fry during the Spring '08 term at University of Florida.