Answer: A magnetic compass has its needle, of mass 0.050
Chapter , Problem 57(choose chapter or problem)
A magnetic compass has its needle, of mass 0.050 kg and length 4.0 cm, aligned with the horizontal component of Earth's magnetic field at a place where that component has the value B" = 16 fLT. After the compass is given a momentary gentle shake, the needle oscillates with angular frequency w = 45 rad/s. Assuming that the needle is a uniform thin rod mounted at its center, find the magnitude of its magnetic dipole moment.
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