A magnetized sewing needle has a magnetic moment of 9.70 mA ·m^2 . At its location, the Earth's magnetic field is 55.0 μT northward at 48.0^∘ below the horizontal. Identify the orientations of the needle that represent (a) the minimum potential energy and (b) the maximum potential energy of the needle-field system. (c) How much work must be done on the system to move the needle from the minimum to the maximum potential energy orientation? | Numerade
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