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Tipler Physics Ch 24
Capacitance
9
Physics
Undergraduate 2
05/26/2008

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Cards

Term
What is the equation for voltage in a spherical conductor if V=0 is chosen at infinity?
Definition
V = kQ/R
Term
What is self-capacitance?
Definition

The amount of charge a conductor can hold at a given voltage difference

 

C = Q/V

Term

What does capacitance depend on?

Definition

The size, shape, and relative positions of the conductors

 

C = Q/V = Q/(kQ/R) = R/K

Term
What is capacitance measured in?
Definition

Farad

1 F = 1C/V

Term
What is the capacitance of a parallel-plate capacitor?
Definition

C = εoA/d

A = Area of one of the plates

d = distance between capacitors

εo =  8.85 x 10-12 F/m

Term
What is the capacitance of a cylindrical capacitor?
Definition

C = 2 pi εoL

ln(R2/R1)

 

R1= Inner radius

R2 = Outer radius

L = length of capacitor

Term
What are the equations for the energy stored in a capacitor?
Definition
U = 1/2 Q2/C = 1/2 QV = 1/2 CV2
Term

What is the energy density of an electrostatic field?

Definition
1/2 εoE2
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