Electric field in a spherical capacitor.

Felpudio

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.

Homework Equations

The potential difference between the plates is $$Δϕ=(Q/4πϵ_0)(1/b-1/a)$$

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