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brcole
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Homework Statement
A circular plastic disk with radius R = 1.80 cm has a uniformly distributed charge of Q = + 2.15 106 e on one face. A circular ring of width 30 µm is centered on that face, with the center of the ring at radius r = 0.50 cm. What charge is contained within the width of the ring?
Homework Equations
E=σ/2ε(1-z/√(z^2+R^2 ))
The Attempt at a Solution
e=8.85e-12
o= 2.15e6
z=.5 cm
r= 1.8
Ans=3.15 e10