L6_8Apr_posted

# L6_8Apr_posted - Housekeeping HW2 is due Monday. Labs start...

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1 Physics 6C: Applications of Gauss’s Law 2 Housekeeping HW2 is due Monday. Labs start next week. 3 Flux through flat surface same number of field lines cross both surfaces so flux through one equal flux through other 4 Flux, more generally

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5 Flux, some details negative (–) zero positive (+) 6 Flux from a point charge Spheres centered on charge -- field is always perpendicular to surface 7 Big picture Gauss’s law is a statement that… ! electric fields originate from charges ! as fall off as 1/r 2 as you move away from a point charge Exactly the same “physics” as Coulombs law It is the first of Maxwell’s Equations 8 Dot product and orientation Flux is maximum when field is perpendicular to surface ! positive when field points in outward direction ! negative when field points inward
9 From Wednesday… The box at the right sits in a uniform electric field E = 5 N/C x and has dimensions ! length( x -direction) 4m ! height ( y -direction) 1m ! width ( z -direction) 3m The total flux through the surface of the box is… A. -5(3x1) + 5(3x1) = 0 Nm 2 /C B. 5(3x1) + 5(3x1) = 30 Nm 2 /C C. 5 [2(3x1) + 2(4x3) + 2(4x1)] = 190 Nm 2 /C D. 5[2(4x3) +2(4x1)] = 160 Nm 2 /C E. 5(4x3x1) = 600 Nm 3 /C ˆ x y z 4m 1m 3m " 10 Clicker question The box at the right sits in an electric field that can be described as E(x,y,z) = (1 + x) x N/C. The total flux through the surface of the box is… A. zero B. positive C. negative D. not enough information to know ˆ x y z 4m 1m 3m " The two ends of the box parallel to the

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L6_8Apr_posted - Housekeeping HW2 is due Monday. Labs start...

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