Electrostatics with Conductors

 

Demonstration: Making a Van de Graaff

Explanation of how a Van de Graaff generator works, with a demonstration of making one manually.

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  • Watch video clip from Lecture 8 (41:41 - 51:01)

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Demonstration: Kelvin Water Dropper

A power supply generated from falling water. Not explained until a later lecture.

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  • Watch video clip from Lecture 10 (44:02 - 50:03)

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Charge on a Solid Conductor

Electric field inside a conductor is always zero. Charge on a conductor is distributed on the surface. Example of positive charge placed on a heart-shaped conductor.

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  • Watch video clip from Lecture 5 (20:33 - 25:21)

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Charge on a Hollow Conductor

Charge placed on a hollow conductor will be distributed only on the outside surface. Demonstration using a metal paint can showing that there is no electric field inside a charged hollow conductor. Electric shielding is defined.

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  • Watch video clip from Lecture 5 (25:21 - 31:50)

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Hollow Conductor in an External Electric Field

No electric field inside a hollow conductor that is placed in an electric field. Electric shielding and the Faraday cage are defined.

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  • Watch video clip from Lecture 5 (31:50 - 36:28)

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Charge Inside a Hollow Conductor

If charge placed inside a hollow conductor, there will be an opposite charge distributed on inside surface and an equal charge on the outside surface of the conductor.

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  • Watch video clip from Lecture 5 (37:07 - 43:12)

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Demonstrations: Faraday Cage

Using a paint can to show that a hollow conductor in an electric field has charge distributed on the outside but no charge on the inside surface. Bringing a radio into a giant Faraday cage to demonstrate electric shielding. Getting inside a charged Faraday cage to show there is no charge on the inside surface.

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  • Watch video clip from Lecture 5 (43:12 - 49:58)

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Charge Density on Asymmetric Conductors

Finding the charge density and electric field for conductors that are not completely symmetric.

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  • Watch video clip from Lecture 6 (0:00 - 6:29)

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Demonstration: Non-Uniform Charge Density

Charging up a metal cooking pot to show that there is higher charge density where the curvature is greater on a conductor.

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  • Watch video clip from Lecture 6 (6:29 - 9:05)

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Kelvin Water Dropper Explained

How ionized water and gravity generate the large potential differences in the Kelvin Water Dropper.

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  • Watch video clip from Lecture 15 (27:24 - 35:27)

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Demonstration: Kelvin Water Dropper Revisited

Repositioning the components of the Kelvin Water Dropper to demonstrate other interesting behavior.

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  • Watch video clip from Lecture 15 (35:27 - 47:18)

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Conductors and Equipotentials

Introduction of conductors and their properties, including the relevance of equipotentials.

  • 8.02 Physics II: Electricity and Magnetism, Spring 2007
    Prof. John Belcher, Dr. Peter Dourmashkin, Prof. Robert Redwine, Prof. Bruce Knuteson, Prof. Gunther Roland, Prof. Bolek Wyslouch, Dr. Brian Wecht, Prof. Eric Katsavounidis, Prof. Robert Simcoe, Prof. Joseph Formaggio, Andy Neely, Matthew Strafuss, Prof. Eric Hudson, Dr. Sen-Ben Liao

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Conductors as Shields

Hollow conductors and how they allow for shielding of electromagnetic field.

  • 8.02 Physics II: Electricity and Magnetism, Spring 2007
    Prof. John Belcher, Dr. Peter Dourmashkin, Prof. Robert Redwine, Prof. Bruce Knuteson, Prof. Gunther Roland, Prof. Bolek Wyslouch, Dr. Brian Wecht, Prof. Eric Katsavounidis, Prof. Robert Simcoe, Prof. Joseph Formaggio, Andy Neely, Matthew Strafuss, Prof. Eric Hudson, Dr. Sen-Ben Liao

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Charges in Conductors

Conductors and insulators defined; e-fields inside conductors; uniqueness theorem and potential inside cavities.

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Conductors

Definition of conductors and their properties; examples of how to determine charge on a conductor and electric field and potential around a conductor.

  • 8.02 Physics II: Electricity and Magnetism, Spring 2007
    Prof. John Belcher, Dr. Peter Dourmashkin, Prof. Robert Redwine, Prof. Bruce Knuteson, Prof. Gunther Roland, Prof. Bolek Wyslouch, Dr. Brian Wecht, Prof. Eric Katsavounidis, Prof. Robert Simcoe, Prof. Joseph Formaggio, Andy Neely, Matthew Strafuss, Prof. Eric Hudson, Dr. Sen-Ben Liao

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Force on a Conducting Surface

Determining force on a surface of a conductor; derivation of electrostatic pressure.

  • 8.02 Physics II: Electricity and Magnetism, Spring 2007
    Prof. John Belcher, Dr. Peter Dourmashkin, Prof. Robert Redwine, Prof. Bruce Knuteson, Prof. Gunther Roland, Prof. Bolek Wyslouch, Dr. Brian Wecht, Prof. Eric Katsavounidis, Prof. Robert Simcoe, Prof. Joseph Formaggio, Andy Neely, Matthew Strafuss, Prof. Eric Hudson, Dr. Sen-Ben Liao

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Point Charge in a Hollow Sphere

3-part Gauss's law problem; determining qualitative charge distributions for different locations of the charge.

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Van de Graaff Generator

Calculating current, charge, capacitance delivered to Van de Graaff generator.

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Kelvin Water Dropper

Explaining creation of sparks in the apparatus.

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Ellipsoid Conductor

Drawing and explaining electric field near ellipsoid conductor.

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Connected Spherical Conductors

Explaining charged object interaction with uncharged conductors and insulators.

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Interactions with Uncharged Objects

Explaining charged object interaction with uncharged conductors and insulators.

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Charging By Induction

Applet demonstrating a method for charging a conductor without ever making direct contact.

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The Charged Metal Slab

Applet simulating the behavior of charges in a charged conducting slab.

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