Physics Chapter 24: Capacitance and Dielectrics

Capacitor:

two nearby surfaces of equal and opposite charge —> stores potentia energy

what is the voltage of capacitor?

voltage of the battery

formula for capacitance

what does this measure?

C = Q V

the strength of capacitor

E field between plates is what?

What about outside plates?

Uniform

outside = 0

magnitude of uniform electric field within capacitor

E = Q/ E(0) A

three general formulas for energy stores in any capacitor

U = ½ CV² = ½ QV = ½ Q² / C

energy of a parallel plate capacitor

½ CV² / A(d) = ½ E(0) E²

Series vs Parallel chart

Dielectric

insulator between charges plates increase capacitance

C = k C(0)

Dielectric Constant charge vs constant voltage

dielecric always ___ e fields

weaken e fields E = E(0) / k