lecture 3

lecture 3 - Lecture 01/20 Outline Section 18.7: Electric...

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1 Lecture 01/20 Outline Section 18.7: Electric field lines Faraday’s lines of forces, electric dipole Section 18.8: Electric filed inside a conductor Shielding Section 18.9: Gauss’ Law Electric flux ( Φ ) Chapter review and Quiz (no grading this time!) Problem solving
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2 18.7 Electric Field Lines So a charged object fills all space with an electric field. Can we visualize the field??? Yes!!! And we can do this by using a positive test charge . Let’s start simple and try to map out the field lines around a positive point charge: + Move the test charge around the point charge and note the direction of the force on it. + Continue this process: + *Notice that the force vector arrows get shorter as we go farther away from the charge, since the force gets smaller. Now let’s connect the arrows!!!. ..
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3 *The electrical field lines of a positive point charge point radially outward away from the charge and fill all space. By a similar construction, we can show that the field lines around a negative point charge look like this: - i.e. the field lines around a negative charge point radially in toward the charge. Spherical in 3 dimensions!!! + E
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4 Electric field lines always start at and are directed away from positive charges and always end at and are directed toward negative charges . But what would the electric field look like in a region of space with more than one charge??? Consider an electric dipole : Two equal but opposite charges separated by some distance r.
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This note was uploaded on 08/04/2009 for the course PHYS 2002 taught by Professor Blackmon during the Spring '08 term at LSU.

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lecture 3 - Lecture 01/20 Outline Section 18.7: Electric...

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