Consider the following image. (a) Find the net electric flux through the closed

Question

Consider the following image.

(a) Find the net electric flux through the closed spherical surface in a uniform electric field shown in Figure a. (Use any variable or symbol stated above along with the following as necessary: E and ?.)
? = ____________

(b) Find the net electric flux through the closed cylindrical surface shown in Figure b. (Use any variable or symbol stated above along with the following as necessary: E and ?.)
? =___________

(c) What can you conclude about the charges, if any, inside the cylindrical surface?

Explanation / Answer

electrric flux from Gauss Law is given as flux = Q/eo = E* A

where E is electric field

A is Area = 4pi r^2 for   Sphere

and A = 2pirL   for Cylinder

so

partA:

flux = E* 4pi R^2

part B:

flux = E * 2pir L

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those must be point charges as field lines are in out ward direction

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