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Two small spherical balls each carrying a charge Q
\( \mathrm{P} \) \( =10 \mu \mathrm{C}(10 \) micro-coulomb \( ) \) are suspended by two insulating threads of equal lengths \( 1 \mathrm{~m} \) each, from a
W point fixed in the ceiling. It is found that in equilibrium threads are separated by an angle \( 60^{\circ} \) between them, as shown in the figure. What is the tension in the threads
(Given: \( \frac{1}{\left(4 \pi \varepsilon_{0}\right)}=9 \times 10^{9} \mathrm{Nm} / \mathrm{C}^{2} \) )
(A) \( 18 \mathrm{~N} \)
(B) \( 1.8 \mathrm{~N} \)
(C) \( \cdot 0.18 \mathrm{~N} \)
(D) None of the above
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