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Photo-copiers, and a review of electric charge

Charge

• Experiments
• Charging an Object
• Four charges
• Calculating charge
• Charge and mass
• Two Spheres

Conductors and insulators

• An electroscope
• Charging a conductor
• Playing with an electroscope
• More Experiments
• Two Objects
• Charging by Induction
• As Time Goes By

Coulomb's Law

• Force between Charges
• The magnitude of the force
• 2-D Examples
• 1-D Example

Three charges

• Three Charges
• Graphing

Field

• What is a Field?
• The Parallel With Gravity
• Projectile Motion
• Field Lines and Field Vectors
• A Test Charge
• A Dipole
• Field Lines
• Field Vectors

Finding the Field using Vector Addition

• The Field from Multiple Point Charges
• Where is the Field Zero?

Graphs

External Links

• Phet simulations
• Photocopier, at Wikipedia
• Photocopiers at How Stuff Works
• Xerographic copiers at How Things Works
• The Invention of of Xerography