Example

• Suppose we have 4 concentric cylinders of radii a,b,c,d and charges +Q, -Q, +Q, -Q

• Question: What is the capacitance between a and d?

• Note: E field between b and c is zero! WHY??
  • A sphere of radius r1: b<r1<c encloses zero charge!

Note: This is just the result for 2 cylindrical capacitors in series!

Previous slide

Next slide

Back to first slide

View graphic version