Insulated wires are of negligible diameter
A long pair of wires conducts 23.7 A of dc current to, and from, an instrument. If the insulated wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field d = 11.6 cm from their midpoint, in their plane.
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A wire forms a semicircle of radius R = 7.10 cm and two (radial) straight segments each of length L = 13.1 cm. The wire carries current i = 48.0 mA. What is the magnitude and direction of the net magnetic field at the semicircle's center of curvat
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