Homework Help: Physics

Posted by Rachel on Tuesday, February 1, 2011 at 6:56pm.

A small m = 2.00 g plastic ball is suspended by a L = 24.0 cm long string in a uniform electric field, as shown in Figure P15.50. If the ball is in equilibrium when the string makes a 18.0° angle with the vertical as indicated, what is the net charge on the ball?

Physics - Heather, Wednesday, February 9, 2011 at 10:39pm
To slove as listed, you need to know the charge of the Electric Field:

Fx=Fy
Eqsin(18)= mgcos(18)

q=mgcos(18)/ Esin(18)

since cos/sin= tan

q= mg tan(18)/E

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