Hello,(adsbygoogle = window.adsbygoogle || []).push({});

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?

**Physics Forums - The Fusion of Science and Community**

# Electric field of a uniformly charged disk

Know someone interested in this topic? Share a link to this question via email,
Google+,
Twitter, or
Facebook

Have something to add?

- Similar discussions for: Electric field of a uniformly charged disk

Loading...

**Physics Forums - The Fusion of Science and Community**