Charge and Coulomb's Law

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  • Polarization
    Charging a glass rod with silk, then inducing a polarization of charge in a conductor. Properties of conductors. Demonstration: Using balloons to demonstrate induction of positive and negative charges with conductors and non-conductors.
  • Charging Through Friction
    Friction creates a charge when combing your hair, touching a doorknob after walking on a carpet, using saran wrap and cellophane. Experiment: Beating a student with cat fur to create a charge, then discharging by touching a neon discharge tube.
  • Van de Graaff Generator
    Demonstration of a Van de Graaff generator used to charge confetti, causing it to jump in the air.
  • Human Electroscope
    Definition of electroscope as a device for measuring charge. Professor Lewin demonstrates a human electroscope by charging himself with the Van de Graaff and holding pieces of tinsel.

Course: 8.02 Electricity and Magnetism, Spring 2002

Instructor: Prof. Walter Lewin