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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

0.18N

B

18N

C

1.8N

D

None of above

Text Solution

Verified by Experts

The correct Answer is:
C

`T sin 30^@= (K times (10 times 10^-6)^2)/(1)^2`
`T=9 times 10^9 times 10^-10 times 2`
`T=1.8 N`
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