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Electric field in a spherical capacitor.

  • Thread starter Felpudio
  • Start date
  • #1
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Homework Statement



The potential difference Δϕ between the plates of a spherical capacitor is kept constant. Show that then the electric field at the surface of the inner sphere will be a minimum if a=(1/2)b, find that minimum.
Where: a=radius of the inner sphere, b=radius of the outside sphere.

Homework Equations


The potential difference between the plates is [tex]Δϕ=(Q/4πϵ_0)(1/b-1/a)[/tex]
 
Last edited:

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
2019 Award
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Hi Fel, welcome to PF :smile: !

There is something special about the PF homework part you need to know: the guidelines require you present an attempt at solution !

So no point in erasing part 3 of the template: we can't help until you show an effort!

The Attempt at a Solution


For a start, you might bring in an eqation for the electric field at the surface of the inner sphere, expressed in a and ##\Delta \phi##.
 

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