LectureSlides - Housekeeping Physics 6C: Electric Potential...

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1 Physics 6C: Electric Potential 2 Housekeeping HW2 is due today. Labs start this week. Midterm 1 -- Friday 4/22 ! covers material through HW3 3 Gauss’s Law The total electric flux out of a closed region is proportional to the enclosed charge 4 Choosing a “gaussian surface” Look for a surface where geometry/symmetry tell you field will be constant x y z 4m 1m 3m
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5 Sheet of positive charge Surface charge density ! + + + + + + + + + + + 6 Sheet of negative charge Surface charge density - ! - - - - - - - - - - - 7 Together - - - - - - - - - - - + + + + + + + + + + + 8 Together - - - - - - - - - - - + + + + + + + + + + +
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9 Electric fields and conductors 10 At the surface of conductors Gauss’s law can be used to find the field at the surface of a conductor… Very close to surface it looks like a flat sheet ! look at a “gaussian box” » flux through bottom is 0 » flux through top is E x (Box Area) ++++++++++++++++++++++++++ " 11 Clicker question A positive charge is kept (fixed) off-center inside a fixed spherical, electrically neutral
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LectureSlides - Housekeeping Physics 6C: Electric Potential...

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