Gauss's law

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Video Clips

Gauss's Law (8.02, Spring 2002)

Video RealVideo®
5:39 minutes (7:11 - 12:50)

Calculating the flux through a sphere around a point charge, leading to the statement of Gauss's Law that flux through a closed surface is proportional to the net charge enclosed by the surface.

Prior Knowledge: Electric Field (beginning of video lecture 2), Electric Flux (beginning of video lecture 3)
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Video RealVideo®
10:53 minutes (12:50 - 23:43)

Need symmetric situations to find electric field using Gauss's Law. Example of finding the electric field inside and outside a hollow sphere with uniformly distributed charge. Comparison to gravitational field.

Prior Knowledge: Gauss's Law (7:11 of video lecture 3)
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Gauss's Law With Planar Symmetry (8.02, Spring 2002)

Video RealVideo®
6:22 minutes (23:43 - 30:05)

Finding the electric field around a plane with uniformly distributed charge. Result is stated, but some of the work is left to students as an exercise.

Prior Knowledge: Gauss's Law (7:11 of video lecture 3)
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Video RealVideo®
8:44 minutes (3:03 - 11:47)

Finding the magnitude and direction of the electric field created by a long cylinder with uniform charge density.

Prior Knowledge: Gauss's Law (7:11 of video lecture 3)
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Lecture Notes

Gauss's Law (8.02T, Spring 2005)

Document PDF
Page 7 to page 22

Electric flux through a closed surface is proportional to the total charge enclosed by the surface. Electric flux and closed surface are defined. Diagrams of flux through open and closed surfaces. Example of calculating electric flux through a sphere.

Prior Knowledge: Electric Fields (Pages 45-54 of Presentation 1)
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Using Gauss's Law (8.02T, Spring 2005)

Document PDF
Page 23 to page 41

Step-by-step methods for applying Gauss's Law and for choosing Gaussian surfaces. Table of Gaussian surfaces used for sources with spherical, symmetrical, and planar symmetry. Includes a worked example with diagrams for each type of symmetry.

Prior Knowledge: Gauss's Law (Pages 7-22 of Presentation 5)
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Review: Gauss's Law (8.02T, Spring 2005)

Document PDF - 1.0 MB
Page 1 to page 3

Brief statement of the equation for Gauss's Law and a list of symmetry types (spherical, cylindrical, planar).

Prior Knowledge: Gauss's Law (Pages 7-41 of Presentation 5)
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Exam Problem: Gauss's Law (8.02T, Spring 2005)

Document PDF#
Page 27 to page 32

Finding the electric field, electric potential, magnetic field, and field energy between the plates of a charging capacitor.

Prior Knowledge: Gauss's Law (Pages 7-22 of Presentation 5) and Ampere's Law (Pages 21-26 of Presentation 18)
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Electric Flux and Gauss's Law (8.02T, Spring 2005)

Document PDF
Page 1 to page 2

Definition of flux through a surface. Statement of Gauss's Law with descriptions of the types of symmetry used in Gauss's Law and a step-by-step method for applying it.

Prior Knowledge: Electric Field (R2)
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Electric Flux (8.022, Fall 2004)

Document PDF
Page 7 to page 11

Definition; flux through cylinder and closed surfaces; flux with contained charge; Gauss's Law.

Prior Knowledge: Electric field
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Gauss's Law (8.022, Fall 2004)

Document PDF
Page 12 to page 14

Restatement; application to sphere of charge, shell of charge, plane of charge.

Prior Knowledge: Electric flux
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Proof of Gauss's Law (8.022, Fall 2004)

Document PDF
Page 2 to page 3

Theoretical and experimental verification of Gauss's Law.

Prior Knowledge: Gauss's Law
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Divergence (8.022, Fall 2004)

Document PDF
Page 8 to page 11

Application of divergence to Gauss's Law; divergence theorem; definition with limits and derivatives; finding E from V.

Prior Knowledge: Gauss's Law
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Online Textbook Chapters

Flux and Gauss's Law (8.02T, Spring 2005)

Document PDF
Page 2 to page 8

Electric flux defined; Gauss's Law and Gaussian surfaces; symmetry concerns.

Prior Knowledge: Electric fields
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Gauss's Law Applications (8.02T, Spring 2005)

Document PDF
Page 8 to page 15

Use of Gauss's Law for infinite rod, infinite plane, spherical shell, uniformly charged sphere.

Prior Knowledge: Gauss's Law
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Worked Gauss's Law Problems (8.02T, Spring 2005)

Document PDF
Page 30 to page 36

Strategies and solved Gauss's Law problems: Parallel planes; flux through flat surface; gravity; potential of sphere.

Prior Knowledge: Gauss's Law
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Practice Problems

Electric Flux (8.02T, Spring 2005)

Document PDF
Problem 11 to problem 14

Two questions about electric flux through a plane and a sphere, with answers and explanations.

Prior Knowledge: None
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Gauss's Law (8.02T, Spring 2005)

Document PDF
Problem 15 to problem 22

Questions about Gauss's Law and its applications, with answers and explanation.

Prior Knowledge: None
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Electric Field From Charged Disk (8.02, Spring 2002)

Document PDF
Problem 4

5-part E-field problem; calculating and plotting E-field along z-axis; limiting cases; connection to Coulomb's law.

Prior Knowledge: None
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Infinite Charged Sheet (8.02, Spring 2002)

Document PDF
Problem 6

4-part Gauss's law problem; finding E-field in 3 cases; plotting along z-axis.

Prior Knowledge: None
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Point Charge in a Hollow Sphere (8.02, Spring 2002)

Document PDF
Problem 1

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

Prior Knowledge: None
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Electric Field From Cylinder (8.02, Spring 2002)

Document PDF
Problem 2

3-part Gauss's law problem; finding radial E-field and potential.

Prior Knowledge: None
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Uniform Plane Charge (8.02X, Spring 2005)

Document PDF
Problem 1

Drawing and explaining electric field near sheet of charge.

Prior Knowledge: None
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Exam Questions

Charged Cylinder (8.02, Spring 2002)

Document PDF
Problem 3

4-part problem; finding charge distribution, electric field, and potential for charged cylinder, then again with a dielectric.

Prior Knowledge: None
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Charged Sphere Inside a Shell (8.02X, Spring 2005)

Document PDF
Problem 3

Finding charge distribution, E-field, and field lines of positive sphere inside negative spherical shell.

Prior Knowledge: None
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MIT courses referenced in this section: