March 1, 2017

Homework Help: physics

Posted by Anonymous on Monday, February 11, 2008 at 1:05am.

A small 2g plastic ball is suspended by a 20 cm long string in a uniform electric field. If the ball is in equilibrium when the string makes a 15 degree angle with the vertical, what is the net charge on the ball? E=10^3 N/c(answer: 5.25x10^-6)

I know E=q/r^2

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