PHY 2049 Midterm: University of Florida PHY 2049 exam2fall10
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Exam 3 solutions: the magnetic dipole moment of a substance aligns opposite to the direction of an applied magnetic eld. The magnetic property of such a substance can be characterized as: Solution: because h ~b d~s = o o(d e/dt) = oid, integrating around a circular path of radius 0. 05 m yields. What is magnitude of the magnetic eld that is induced at a radius of r = 3 cm? (hint: r > r). Solution: because h ~b d~s = o o(d e/dt), integrating around a circular path of radius 3 cm yields 2 b(0. 03m) = Note that the radius of the path, 3 cm, is di erent from the radius where the electric eld is nonzero, 1 cm: the magnetic dipole moment of an atom is 9. 27 10 24 j/t. Solution: the energy of a magnetic dipole in a magnetic eld is u = ~ ~b. Solution: after passing through the rst polarizer the intensity goes down by 2.
