AP Physics 2: Algebra-Based Unit 10 Topic 1: Electric systems and charge

What to Know

Charge is conserved, so net charge changes only by transfer across a system boundary.
Like charges repel and opposite charges attract.
Electric interactions can act without contact through electric fields.
Always connect this topic back to the larger unit: Electric Force, Field, and Potential.

Detailed Notes

Electric systems and charge belongs to Unit 10: Electric Force, Field, and Potential. Electric systems are analyzed by identifying charged objects, interactions, and the system boundary. Start by identifying the system, the field or interaction involved, and which conservation law or model applies.

Key relationships: Charge is conserved, so net charge changes only by transfer across a system boundary. Like charges repel and opposite charges attract. Electric interactions can act without contact through electric fields.

Model to use: Draw the charged objects, label signs of charge, and identify whether the system includes all interacting charges. A clear AP Physics 2 model should label directions, signs, units, and the physical meaning of each variable.

AP-style move: Track charge conservation separately from force direction; charge can move while total system charge remains constant. For free-response work, show the governing principle first, then connect the mathematical result back to the physical situation.

Key Vocabulary

Electric charge

A property of matter that causes electric interactions.

Charge conservation

The principle that net electric charge is not created or destroyed.

Point charge

A charged object modeled as having charge concentrated at one point.

Electric interaction

Attraction or repulsion between charged objects.

Net charge

The algebraic sum of positive and negative charge.

Quick Practice

How would you explain Electric systems and charge in one or two AP-style sentences?

Name the concept, apply it to a specific example or source, and explain the reasoning that connects the evidence to your answer.

Official Alignment

Reference and Attribution

AP Physics 2 concept reference: AP Physics 2: Concise Summary Notes by IITian Academy. EduCompanion used this source as a topic checklist and conceptual reference, then rewrote the study notes in original wording.

AP Physics 2: Concise Summary Notes