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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 (1)

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Post by barry ben-ishai on June 8, 2013

So, if i am in a metallic house, and hold my hand to a wall, and lighting strikes the outside of the house, i wont get electrocuted?

Electric Potential, Part 4

  • For a conductor, any excess charge must reside on the surface. Second, the electric field inside the conductor is zero. Third, E on the surface is perpendicular to the surface, and is given by sigma/epsilon_0, where sigma is the surface charge density. Fourth, the whole conductor is an equipotential region; i.e., all points on or within the conductor are at the same potential.
  • If a conducting sphere has a total charge Q distributed on its surface, the potential inside the sphere is given by kQ/R, where R is the radius of the sphere.
  • In a cavity within a conductor, the electric field is zero; if it were not, the inner surface of the conductor would not be an equipotential surface. The vanishing of E in the cavity explains why conductors are used as electrical shields.

Electric Potential, Part 4

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
  • Charged Conductors 0:12
    • Adding Excess Charge to a Conductor
    • E=0 Inside Conductors
    • Excess Charges Must Reside on Surface
    • E Normal on the Surface
    • Surface of Conductor is Equipotential
  • Conducting Sphere 19:28
    • Adding Charge to the Sphere
    • Electric Field Outside is Concentrated at Center
    • Electric Potential is Same as Center
  • Example 26:24
    • Two Spheres with Distance and of Different Size
    • Connecting Both Spheres with Conducting Wire
  • Cavity Within a Conductor 39:43
    • Hollow Conductor
    • Electric Static Equilibrium
    • Electric Field is Zero Within Cavity
  • Example 1: Neutral Conducting Sphere
  • Example 2: Conducting Sphere with Spherical Shell