Question

Question 4 Which of the 3-dimensional surfaces in the figure below has the greatest net flux passing through it? Surface A is a cylinder of volume V with a +3q point charge inside it, and a +3q point charge outside of it. Surface B is a sphere of volume V with a +3q point charge inside of it. Surface C is a large pyramid of volume V with a +3q point charge inside of Surface D is a cube of volume V with three separate +q point charges Surface E is a small pyramid of volume V/3 with a +3q point charge inside inside of it of it. 3q 3q 3q

Answer 1

From Gauss's law:

Net flux through a closed surface = enclosed charge / $\epsilon$_o

Now, since all the given figures from A to E have closed surfaces, and all of them encloses same charge +3Q

therefore all of the given shapes have same amount of net flux though them.