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Introductory Physics Homework Help
Finding Area of Ring Segment to Find Electric Field of Disk
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[QUOTE="kuruman, post: 6826959, member: 192687"] Cut the thin ring and stretch it out. You get a rectangular strip of length ##2\pi r## and width ##dr##. What is its area? The area of the annulus is indeed what google says. Note that ##R^2-r^2=(R+r)(R-r)## For a [B]thin[/B] ring ##R## and ##r## are very close to each other so that ##R-r=dr##. You can then approximate ##R+r\approx 2r## so that ##R^2-r^2\approx 2rdr##. [/QUOTE]
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Introductory Physics Homework Help
Finding Area of Ring Segment to Find Electric Field of Disk
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