ElectrostaticsHard
Question
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 16 g cm-3, the dielectric constant of the liquid is
Options
A.4
B.3
C.2
D.1
Solution
From F.B.D of sphere, using Lami’s theorem
= tanθ ......(i)when suspended in liquid, as q remains same,
∴
......(ii)using (i) and (ii)
where F′ = 
∴
or 
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