Question:
Two identical spherical balls of density D are suspended on vertical threads at a distance r from each other in vaccum. The balls are given equal charges and immersed in a liquid of density d and dielectric constant K. If threads are not deflected from the vertical in vaccum as well as in dielectric liquid. Then
Answer:
Density of the material of the ball = D
Density of the liquid = d
Dielectric constant of the medium = K = D / (D- d)
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