Conductors, Capacitors, Dielectrics — AP Physics C: Electricity and Magnetism
1. Unit at a Glance
This unit builds on foundational electrostatics from Unit 1 to analyze practical electrostatic systems and core circuit components. We start with the behavior of conductors in electrostatic equilibrium, then move to capacitors—one of the most fundamental components in electric circuits—before covering how insulating dielectrics change capacitor performance.
The learning arc connects microscopic electrostatic behavior to macroscopic circuit properties that you will use throughout the rest of the E&M course. All subtopics include AP-aligned problem-solving practice aligned to exam expectations.
Common Pitfalls
Why: This is only true for conductors carrying current; conductors in electrostatic equilibrium have zero internal electric field.
Why: Capacitance always increases by a factor of $κ$, but which quantity (charge or voltage) is constant depends on whether the capacitor is connected to a battery.