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Two small spherical balls each carrying ...

Two small spherical balls each carrying a charge `Q= 10 mu C` are suspended by two insulating threads of equal lengths `1 cm` each, from a point fixed in the ceiling. It is found that in equilibrium threads are sepreated by an angle `60^(@)` between them, as shown in figure. What is the tension in the threads
(Given `(1)/(4piepsilon_(0))= 9xx10^(9)Nm//C^(2)` )

A

18 N

B

1.8 N

C

0.18 N

D

None of the above

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The correct Answer is:
B
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