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Lecture%2022%202220%20Spring%202009 - Reminders and...

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1 Reminders and Announcements Homework 13 is due today; HW 14 is due the Tuesday after spring break I have unreturned exams Help Room Hours (Physics 117): M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Magnetic Moments Classical Atom The electrons move in circular orbits The orbiting electron constitutes a tiny current loop The magnetic moment of the electron is associated with this orbital motion L is the angular momentum μ is magnetic moment Magnetic Moments Classical Atom, final The magnetic moment of the electron is proportional to its orbital angular momentum The vectors L and μ point in opposite directions Quantum physics indicates that angular momentum is quantized Magnetic Moments of Multiple Electrons In most substances, the magnetic moment of one electron is canceled by that of another electron orbiting in the same direction The net result is that the magnetic effect produced by the orbital motion of the electrons is either zero or very small Electron Spin Electrons (and other particles) have an intrinsic property called spin that also contributes to their magnetic moment The electron is not physically spinning It has an intrinsic angular momentum as if it were spinning Electron Spin, cont. The classical model of electron spin is the electron spinning on its axis The magnitude of the spin angular momentum is is Planck’s constant 3 2 S
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2 Electron Spin and Magnetic Moment
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