- #1

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

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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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