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+[[Electric Force, Field, and Potential]]
+# Summary
+* Net charge changes only when charge travels in and out of a system.
+* Charging usually happens through electron transfer.
+* Induced charge separation polarizes an object without contact. Happens in neutral conductors and insulators.
+* In conservation problems, charge of separated objects should sum to charge of system.
+* Grounding occurs when a system connects to a large neutral object.
+* Conductors let electrons move easily, insulators only let bound charges shift slightly.
+* Main 3 ways to charge: friction induction contact.