A circular coil of wires (N = 10 turns, R = 3.5 cm) is oriented so that the axis of the coil runs east to west. A compass pointing north sits a distance of d = 12 cm from the center of the coil and lies on the axis of the coil. The horizontal component of the Earth’s magnetic field at this location has a magnitude of 2.5×10−5 T. When a current is turned on the compass needle now points 45◦ west of north. What is the magnitude of the current? When viewed from the compass, does the current go clockwise or counter-clockwise through the coil?
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