Two small spherical balls each carrying a charge 
( 10 micro-coulomb) are suspended by two insulating threads of equal lengths 1m each, from a point fixed in the ceiling. It is found that in equilibrium threads are separated by an angle 
between them, as shown in the figure. What is the tension in the threads (Given: 
)
A
B
C
0.18 N
D
None of the above
Text Solution
Verified by ExpertsThe correct answer is:
B
In the following figure, in equilibrium F e = T sin 30 o , r = 1m
⇒ ⇒ 
= 
⇒ ⇒ 
T = 1.8 N
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