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(B) In equilibrium,the forces acting on one of the spherical balls are the tension $T$ in the thread,the electrostatic force $F_e$,and the gravitation

Vedclass · Accepted Answer

$1.8$

Vedclass · Answer

(B) In equilibrium,the forces acting on one of the spherical balls are the tension $T$ in the thread,the electrostatic force $F_e$,and the gravitational force $mg$.Let the length of the thread be $L = 1\,m$ and the angle with the vertical be $	heta = 30^o$.The distance $r$ between the two charges is $r = 2L \sin(30^o) = 2 	imes 1 	imes 0.5 = 1\,m$.The electrostatic force is $F_e = \frac{1}{4\pi \varepsilon_0} \frac{Q^2}{r^2} = 9 	imes 10^9 	imes \frac{(10 	imes 10^{-6})^2}{1^2} = 9 	imes 10^9 	imes 10^{-10} = 0.9\,N$.For equilibrium in the horizontal direction: $T \sin(30^o) = F_e$.$T 	imes 0.5 = 0.9$.$T = 1.8\,N$.

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