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Two 173 turn coils, each with a diameter of d = 4.45 m, are placed w = 1.31 m apart, as shown in the figure. A current of 6.99 A is flowing in the wires of both coils; the direction of the current is clockwise for both coils when viewed from the left. What is the magnitude of the magnetic field in the center between the two coils?
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The current density in a cylindrical conductor of radius R = 59.9 cm, varies as J(r) = J0r/R (in the region from zero to R), where J0 = 0.511 C/m2.

a) Find the magnitude of the magnetic field at r = 29.95 cm.
b) Find the magnitude of the magnetic field at r = 119.8 cm
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Parallel wires, a distance D = 20.6 cm apart, carry a current, i = 3.67 A, in opposite directions as shown in the figure. A circular loop, of radius R = D/2 = 10.3 cm, has the same current flowing in a counterclockwise direction. Determine the magnitude of the magnetic field from the loop and the parallel wires at the center of the loop.
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A square ammeter has sides of length l = 3.75 cm. The sides of the ammeter are capable of measuring the magnetic field they are subject to. When the ammeter is clamped around a wire carrying a DC current, as shown in the figure, the average value of the magnetic field measured in the sides is 2.73 G. What is the current in the wire?
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You are standing at a spot where the magnetic field of the Earth is horizontal, points due northward, and has magnitude 36.9 μT. Directly above your head, at a height of 12.3 m, a long, horizontal cable carries a steady DC current of 381 A due northward. Calculate the angle θ by which your magnetic compass needle is deflected from true magnetic north by the effect of the cable.