Physics 201- Introduction to Electricity & Magnetism
October 7- Capacitor Networks

 

 

 

 
 

 

  How do we compute the capacitance of an object? 
  • If the objects are uncharged, give them a fictional charge.  Now compute the potential difference between them, usually do this by first finding the electric field by Gauss' law (or some other simple technique).  Then divide Q by V to get C.
  • Once you know the capacitance of an object you can then use that and voltage to find the charge on the capacitor.
  • Well later look more at their energy storing abilities, signal processing (how capacitors alter current).

Find the capacitance of two concentric, conducting spheres with radii R1 and R2 (R1 < R2).
 
 
 

 

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Jeff Phillips
phillips@lmu.edu
Loyola Marymount University
Fall 2002