The needle of a magnetic compass has a length of 3 cm, a radius of 0.85 mm,
Question:
The needle of a magnetic compass has a length of 3 cm, a radius of 0.85 mm, and a density of 7.96 × 103 kg/m3. It is free to rotate in a horizontal plane, where the horizontal component of the earth's magnetic field is 0.6 G. When disturbed slightly, the compass executes simple harmonic motion about its midpoint with a frequency of 1.4 Hz.
(a) What is the magnetic dipole moment of the needle?
(b) What is the magnetization M?
(c) What is the amperian current on the surface of the needle?
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a I mL 2 12 m r 2 L I r 2 L 3 12 I 4...View the full answer
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