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Lectures
Lecture: 20 (iq18)
1. Second order small eps-expansion
for a quadrupole charge system
2. B along z due to a circular ring: Dipole moment of a
loop. clicker 18-2.
Added meaning to RHR3.
3. Magnetic dipole moment of an atom
·
Current loop is
like a magnet. It is a dipole source which generates Bdipole.
·
Measurement of a
magnetic dipole of a bar magnet clicker: Direction of Bearth
·
Dipole moment of a H-like atom in terms of orbital angular momentum.
·
Quantum unit of
atomic dipole moment clicker 19-4
·
Order of
magnitude estimate of the macro-magnetic-dipole-moment of a bar magnet.
4. Ampere’s law
·
B due to a line
segment – a simple example of the Ampere’s law.
·
Hints to homework
problems
1. A cylindrical wire with a circular hole. Ch18-h3:016.
2. Long solenoid: clicker 20-3. Please read it on your own.
Announcement:
o
Ch18-h2, 008. The
two currents are assumed to have the same magnitude.
o
Regular office
hours: MWF 9:15 to 10:15.
o
Review unit2:
o
Work through the
summary of unit2.
o
Part of next
Monday lecture and next Wed lecture will be devoted to review unit 2.
o
Extra review
session: Wed. 5-6pm (location to be announced).
o
Extra office
hours: Thursday office hour: 2-3:30pm.