lecture4 - Physics 2102 Jonathan Dowling Flux Capacitor...

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Physics 2102 Physics 2102 Lecture 4 Lecture 4 Gauss’ Law II Gauss’ Law II Physics 2102 Jonathan Dowling Carl Friedrich Gauss 1777-1855 Version: 1/23/07 Flux Capacitor (Operational)
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HW and Exam Solutions www.phys.lsu.edu/classes/spring2007/phys2102/Solutions/index.html USERNAME: Phys2102 Password: Solution1 Both are: cAsE SenSiTivE!
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Properties of conductors Properties of conductors Inside a conductor in electrostatic equilibrium , the electric field is ZERO . Why? Because if the field is not zero, then charges inside the conductor would be moving. SO: charges in a conductor redistribute themselves wherever they are needed to make the field inside the conductor ZERO. Excess charges are always on the surface of the conductors.
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Gauss’ Law: Example Gauss’ Law: Example A spherical conducting shell has an excess charge of +10 C. A point charge of - 15 C is located at center of the sphere. Use Gauss’ Law to calculate the charge on inner and outer surface of sphere (a) Inner: +15 C; outer: 0 (b) Inner: 0; outer: +10 C (c) Inner: +15 C; outer: -5 C -15 C R 1
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Gauss’ Law: Example Gauss’ Law: Example Inside a conductor, E = 0 under static equilibrium! Otherwise electrons would keep moving!
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lecture4 - Physics 2102 Jonathan Dowling Flux Capacitor...

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