Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30º with each other. When suspended in a liquid of density 0.8 g cm –3 , the angle remains the same. If density of the material of the sphere is 1.6 g cm –3 , the dielectric constant of the liquid is
Text Solution
Verified by ExpertsThe correct answer is:
C
At equilibrium
tanθ/2 = 
= 
. 
When suspended in liquid
tan 
= 
= 
. 
on comparing the two equation we get
K 
= 1
⇒ K = 2.
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