Electrostatic Energy and Capacitors. Capacitance An indication as to how easy it is to accumulate charge on an object. Ex. What is the capacitance of.

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Electrostatic Energy and Capacitors

Capacitance An indication as to how easy it is to accumulate charge on an object. Ex. What is the capacitance of a device if C of charge accumulates on it when 30 V is applied across it? Units 1C/V = 1 F (farad)

Charged Sphere Place + charge on sphere and the corresponding  charge is at infinity. Ex. What radius is required for a sphere to have a capacitance of 4700  F?

Parallel Plates Ex. What dimensions must a square plate capacitor have if it is to have a capacitance of 4700  F when the gap between the plates is 1mm? d

Combinations Capacitors in Parallel Capacitors in Series C1C1 C2C2 C1C1 C2C2

Work and Energy Move a small amount of +charge from the  plate to the + plate. VV Q QQ Energy density in an E field

Dielectrics A nonconducting material placed between conductors to increase capacitance. Ex. What dimensions must a square plate capacitor have if it is to have a capacitance of 4700  F when the gap between the plates is 0.1mm and paper is between them? (dielectric constant for paper is 3.7) Dielectric strength (paper - 16 MV/m)