Four closed surfaces, S1 through S4, together with the charges -2Q, Q, and -Q ar

Question

Four closed surfaces, S1 through S4, together with the charges -2Q, Q, and -Q are sketched in the figure below. (The colored lines are the intersections of the surfaces with the page.) Find the electric flux through each surface. (Use the following as necessary:  ?0 and Q.)

?S1 =

?S2 =

?S3 =

?S4 =

Four closed surfaces, S1 through S4, together with the charges -2Q, Q, and -Q are sketched in the figure below. (The colored lines are the intersections of the surfaces with the page.) Find the electric flux through each surface. (Use the following as necessary: ?0 and Q.) ?S1 = ?S2 = ?S3 = ?S4 =

Explanation / Answer

electric flux=charge enclosed/epsilon

  

S1=(-2Q+Q)/epsilon=-Q/epsilon

S2=(-Q+Q)/epsilon=0

S3=(-2Q+Q-Q)/epsilon=-2Q/epsilon

S4=charge enclosed=O hence flux is 0

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