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.)
Today-
  • 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
phillips@lmu.edu
Loyola Marymount University
Fall 2002