# Electric Flux Leaving Surface

1. Sep 20, 2011

### yoamocuy

1. The problem statement, all variables and given/known data
A point charge of 20 nC is located at (4,-1,-3), and a uniform line charge of -25nC/m lies along the intersection of the planes x=-4 and z=6. (a) Calculate D at (3,1,0). (b) How much electric flux leaves the surface of a sphere of radius 5, centered at the origin? (C) Repeat part b if the radius of the sphere is 10.

2. Relevant equations
Q=total flux enclosed

3. The attempt at a solution
I've already solved part a without a problem but its b and c that are giving me trouble. I seem to be having problems with Gauss's law. A sphere of radius 5 seems like it would enclose the 20nC point charge so wouldnt electric flux simply equal 20 nC. The answer seems to be 0 though.

2. Sep 20, 2011

### pabloenigma

You didnt calculate the line charge enclosed by the sphere.....

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