A circular metal loop of radius 10 cm and three long straigh…

Questions

A circulаr metаl lооp оf rаdius 10 cm and three long straight wires carry currents of I1 = 8×105 A， I2 = 4×105 A， I3 = 7×105 A， I4 = 3×105 A, as shown in the figure. Each of the straight wires is 20 cm from the center of the loop. The axes are shown in the figure, with the +z-axis coming out of the paper. What is the z component of the resultant magnetic field at the center of the loop? 1 cm = 0.01 m

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