Physics 201- Introduction to Electricity & Magnetism
October 4- Capacitors






  Don't forget...
  • The electricity test is next Friday.
  • There is an exercise due Monday- the concept map (Use this to help prepare for the test.)
  • If you are interested in TAing a physics lab next semester, please ask Dr. Jeff about the application process.  (You don't have to be a physics major to TA.)
  • If you are interested in research opportunities in physics, several of the faculty have support for students next semester and during the summer.  (Again, talk to Dr. jeff for more details.)
  • We're going to begin capacitors (chapter 32) (see worksheet)
  • To study them we'll use Gauss' Law as well as electric potential.


During a heart attack, the heart muscles often randomly contract and relax, no longer in the proper sequence.  The way to restore the normal rhythm is to provide a shock to the heart.  This requires a current of 20A for 2ms, which amounts to a transfer of 200J.  This means that the power (rate of energy transfer) is 100kW (105 J/s). 

How can you provide such large power when you are away from the hospital, say on the side of a road?


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Jeff Phillips
Loyola Marymount University
Fall 2002