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ferret123
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Homework Statement
A small disc or radius R with surface normal
ˆ
k is placed a distance z from a point charge −q,( k hat pointing along the z-axis which goes through the charge and the center of the disk.)
Assuming that R ≪ z, derive an expression for the electric flux ΦE passing through
the disc.
Hint: Think of the correct approximation to make before starting the question.
Homework Equations
ΦE= q/ε
The Attempt at a Solution
I'm struggling to think of the approximation to simplify this problem. I can only think that with z much greater than R the disk would be a point charge but that wouldn't help at all. Any help to get started on the problem would be appreciated.