vault backup: 2026-09-06 23:41:08

physics/Electric Force, Field, and Potential/Capacitors.md

@@ -0,0 +1,8 @@
+[[Electric Force, Field, and Potential]]
+# Summary
+* Measured in capacitance ($C=\frac{Q}{\Delta V}$), value fixed by physical build $C=\kappa \epsilon_0\frac{A}{d}$
+* Field between plates is uniform except near edges. $E_C=\frac{Q}{\kappa \epsilon_0 A}$ (equal to $\frac{\Delta V}{d}$)
+* Charged particle between plates feels constant force. Projectile with constant accel.
+* Stored energy written as: $U_C=\frac{1}{2}Q\Delta V=\frac{1}{2}C(\Delta V)^2=\frac{Q^2}{2C}$.
+* Adding dielectric raises capacitance by factor of $\kappa$, sets up induced field inside dielectric that opposes plate field.
+* On AP exam, only parallel plate capacitors required, edge effects ignored unless stated otherwise.