Hi, so I'm really stuck on a past exam question, and my lecturer doesn't bother writing up any working (just the answers) so I have no clue how to get to these answers...the question is as follows:
A single point charge Q is placed in the centre of a circle of radius a, that forms one end of a long cylinder of length h.
a) How much electric flux from the charge passes through the cylinder? (The answer is apparently Q/2*epsilon0, I know I need to use Gauss' Law but how?!)
b) What fraction of this flux passes through each part of the cylinder (each end circle and the curved body of the cylinder)? You may assume h=30a (There is no flux through the face the charge lies on, I get that, but the ratios for the other two surfaces are 1/1800 to 1799/1800, and I'm not sure which value corresponds to which surface).
Any help would be greatly appreciated!