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For more information, please see full course syllabus of AP Physics C/Electricity and Magnetism
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Lecture Comments (3)

1 answer

Last reply by: Arjun J
Thu Feb 19, 2015 7:25 PM

Post by Magesh Prasanna on November 6, 2013

charge is a inherent property like mass.How do we define a charge?

Related Articles:

Electric Force

  • An atom is composed of a nucleus and a surrounding cloud of electrons. Electrons are negatively charged. The nucleus has positively charged protons and neutral (uncharged) neutrons. The SI unit of charge is the Coulomb (C). Charge of a proton = +e = 1.6 x 10^-19 C. Charge of an electron = -e.
  • Like charges repel and unlike charges attract.
  • A conductor has many charge carriers that are free to move. Insulators do not have mobile charges.
  • It is possible to charge an object by contact or by induction.

Electric Force

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Electric Charge 0:18
    • Matter Consists of Atom
    • Two Types of Particles: Protons & Neutrons
    • Object with Excess Electrons: Negatively Charged
    • Carbon Atom
    • Positively Charged Object
  • Electric Charge 10:07
    • Rubber Rod Rubs Against Fur (Negative Charge)
    • Glass Rod Rub Against Silk (Positive Charge)
    • Hanging Rubber Rod
  • Conductors and Insulators 16:00
    • Electrons Close to Nucleus
    • Conductors Have Mobile Charge
    • Insulators: No Moving Electrons
    • Copper Wire Connected to Excess Negative charge
    • Other End Connected to Excess Positive Charge
  • Charging a Metal Object 27:25
    • By Contact
    • Metal Sphere on an Insulating Stand
    • Charging by Induction
    • Negative Rubber Rod
    • Size of Atom
  • Extra Example 1: Three Metallic Objects
  • Extra Example 2: Rubber Rod and Two Metal Spheres