|Feb8-13, 03:52 PM||#1|
Electric field of a uniformly charged disk
I am looking at an example of finding the charge of a uniform disk with a continuous charge on the surface.
They go about the problem by finding the infinitesimal charge of concentric rings
dq = σdA = σ(2πr dr)
The part I don't understand is that they use the area as 2πr dr? The area of a ring would be ∏(R2^2 - R1^2), right?
|Feb8-13, 04:05 PM||#2|
|Feb8-13, 04:14 PM||#3|
Ok I just calculated it and now I see. The book didn't even bother to explain that approximation, which left me confused. Thank you for clearing that up so quickly =)
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