Announcements

1
Announcements

• Homework 3 is due at end of class next Wednesday
• Conference sections have started
• Tuesday 4 5 BH 160
• Friday 1 2 BH 141
• TA Yorgos Papathanasiou email
  Georgios_Papathanasiou_at_brown.edu

2
Potential of a Dipole

• Consider a positive charge q and a negative
  charge q separated by a distance d
• Calculate potential for a dipole at the origin
• Potential will be non-zero because r and r- are
  slightly different

3
Electric Field of a Dipole

• We can calculate the electric field from the
  potential
• Align dipole along z axis, look at points in x-z
  plane (i.e., y 0)

4
Potential for a Continuous Charge Dist.

• If charge is distributed continuously
• Example potential on axis for ring of charge
  with charge density l

5
Potential for a Disk

• Consider a disk as being made up of a series of
  rings of thickness dr