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Point charge and electric flux 
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#1
Feb511, 07:25 PM

P: 74

1. The problem statement, all variables and given/known data
You measure an electric field E at a distance x from a point charge. What is the electric flux through a sphere whose center is at that distance and whose radius is less than x from the charge? 2. Relevant equations E*dA = (q_enc)/(e_0) 3. The attempt at a solution I'm not sure that I'm understanding the question....The sphere does not enclose the point charge since its center is at x and its radius is less than x from the charge, so doesn't that mean q_enc = 0 and the flux is 0? (I have the answer so I know it's not zero, but I don't understand what I'm missing conceptually here....) 


#2
Feb511, 09:59 PM

P: 1,135

net flux is 0
it means the new electric field lines crossing the total surface is 0 look at pic ... all field lines entering exit the Gaussian surface !! so net field through surface is 0 


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