Question: The needle of a magnetic compass has magnetic moment 9.70 mA#m2. At its location, the Earths magnetic field is 55.0 +T north at 48.0 below

The needle of a magnetic compass has magnetic moment 9.70 mA#m2. At its location, the Earth’s magnetic field is 55.0 +T north at 48.0° below the horizontal.
(a) Identify the orientations of the compass needle that represent minimum potential energy and maximum potential energy of the needle–field system.
(b) How much work must be done on the needle to move it from the former to the latter orientation?

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a b The field exerts torque on the needle tending to align it with the field so the mini... View full answer

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