Answer to Question #138230 in Mechanics | Relativity for Philip

Question #138230
A small 2.00 g plastic ball is suspended by a 20.0 cm long string in a uniform electric field. If the ball is in equilibrium when the string makes a 15.0 degree angle with the vertical, what is the net charge on the ball?
1
Expert's answer
2020-10-20T07:14:44-0400


From the picture we can write that

Tcos15o=mgT\cos 15^o=mg ......(1)

Tsin15o=qET\sin15^o=qE ......(2)


From 1 and 2

tan15o=qEmg\tan 15^o=\frac{qE}{mg}

q=0.27×0.002×10/E=0.0054/Eq=0.27\times0.002\times10/E=0.0054/E



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