Jumat, 21 Juni 2013

n.23 - carica

A small m=2.00-g plastic ball is suspended by a L=20.0-cm-long string in a uniform electric field E, as shown in Figure. If the ball is in equilibrium when the string makes a theta=15.0° angle with the vertical as indicated, what is the net charge on the ball?

Sulla pallina agiscono peso P, tensione fune T e forza elettrica F
La pallina è ferma:

orizzontale. F=qE=T sin theta
verticale. P=mg = T cos theta

q= ( mg tg theta) / E

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