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 1.6 g cm–3, the dielectric constant of the liquid is
-
4
-
3
-
2
-
1
Solution
C.
2
From FBD of sphere, using Lami theorem
F/Mg = Tan θ .... (i)
when suspended in liquid as θ remains unchanged,
