What is it called when electric charge is created by two different materials rubbing together?

• A. Charging by Friction
• B. Induction
• C. Static Electricity
• D. Charging by Conduction

Answer: (A)

Rubbing two different materials together causes electrons to move from one material to the other because they have different tendencies to hold onto electrons. This transfer leaves one object with a surplus of electrons (negative charge) and the other with a deficiency (positive charge). The result is a buildup of electric charge known as static electricity, but the specific process of creating that charge by rubbing is called charging by friction.

The other concepts describe different ways charges can appear or distribute without the rubbing action: induction involves charging a neutral object by rearranging its internal charges in response to a nearby charged object, not by contact; conduction involves direct transfer of charge through touching; static electricity is the general observation of that charged state, not the method.