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fizzicmaniac
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Homework Statement
The mass of the ball is 40 milligrams, the applied potential difference is 480 V and the plate separation is 6 centimeters. If the string hangs at an angle of 20 degrees to the vertical, determine the charge on the pith ball.
Homework Equations
[/B]
F=ma
E=F/q
V=E/d
The Attempt at a Solution
This is my work shown to the end, although the answer is wrong I'm not sure what I missed, and any help would be greatly appreciated. The answer is supposed to be 1.8x10^-8, but I'm not sure how to get there.
http://imgur.com/a/sgRUX
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