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April 20, 2014

April 20, 2014

Posted by **Eya** on Saturday, August 11, 2012 at 9:23am.

- algebra -
**Steve**, Saturday, August 11, 2012 at 12:43pmjust plug it in:

1/4 Vm = Vm(1-r^2/R^2)

1 = 4 - 4r^2/R^2

4r^2/R^2 = 3

r^2 = 3/4R^2

r = √3/2 R

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