1. Charge Charge Transfer 1 TOC Charging by Friction (Triboelectric Table) Charging by Contact Charging by Induction Dipole Attraction

2. Charge Charge Transfer 2 TOC Inductors and conductors sometimes exchange charge by rubbing them together. Use the Tribolectric Table to know which way the charges move.

3. Charge Charge Transfer 3 TOC In conductors, electrons are free to move… There are two ways to add charge to a conductor. 1.Touching a charged rod to a conducting sphere transfers electrons to the sphere. This is called charging by contact. A negative total charge remains What would happen if the rod were positive to begin with?

4. Charge Charge Transfer 4 TOC 2.If a charged rod is simply brought near a conducting sphere, the electrons will begin to move. And, some will go into the ground. This is called charging by induction. In conductors, electrons are free to move… There are two ways to add charge to a conductor. A positive total charge remains What would happen if the rod were positive to begin with?

5. Charge Charge Transfer 5 TOC In insulators, electrons are not free to move. They stick to the atom… Insulators can shift their charges and will therefore attract any charged conductor. 1.A negative conductor repels the electrons and is then attracted by the closer protons. 2.A positive conductor attracts the electrons and is then attracted by these closer electrons.

6. Charge Charge Transfer 6 TOC Dipoles are pairs of positive and negative charge that can rotate but not translate. Like insulators they always attract the conductor. 1.A negative conductor causes the dipole to rotate so that the positive charge is closer to the conductor. 2.A positive conductor causes the dipole to rotate so that the negative charge is closer to the conductor.