Question

Two identical 1.00 g insulating balls with equal charges hang on 21.0 cm long strings as shown in Figure 17.43. Find their charge. (C 0P10 Figure 17.43

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Answer #1

10 T = tension F.-electric force mg We know an Divide the bottom equation by the top one, and remember that sine/cosine tange

The force of +q on -aq separated at 3 cm= F=k(q1q2)/r2, where r= 5 cm,

F= 9*109*(5*5*7.50)/0.052=675 N,

F2= 9*109(5*5*7.50)/0.032=1875 N

total force= F1+F2= 675+1875= 2550 N

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