#1
A nonconducting disk of radius a lies in the z = 0 plane with its center at the origin. The disk is uniformly charged and has a total charge Q. Find Ez on the z axis at the following positions. (Assume that these distances are exact.)

Let: z = a find answer with these units: Q / (a2ε0)

Can anyone point me in the right direction?

Perhaps this equation may need to be used... not sure though: sqrt((1/3)R^2)
#3
You'll need Coulomb's Law



And, hey presto, you're done

Quote by JohnnyTrash
Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A, START


Well done, that was useful
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#7
Quote by saphrax
+infinity

You win.

Im gunna sig that!


There is no equation that can't be solved with the Konami Code.
#9
Quote by Shutout
So if... (a) z = 0.2a wouldnt the answer be 1.989 Q / (a2ε0) ?


I got that, so I think so :P

The disc can be treated as a point charge Q at the origin if the force is being calculated perpendicularly from the centre.
#11
Quote by mynamewontfit
I got that, so I think so :P

The disc can be treated as a point charge Q at the origin if the force is being calculated perpendicularly from the centre.


Hm... not working. Maybe it's a different equation or maybe I'm just doing it wrong... seems to make sense though.