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Standard XII
Physics
Question

Two charged balls of the same radius and weight suspended on threads of equal length are immersed into a liquid having density of d1 and a dielectric constant K. The density d of the material of the balls for the angles of divergence of the threads in the air and in the dielectric to be the same is:


  1. KdK−1
  2. dK−1
  3. K−1d
  4. K−1Kd

A
KdK−1
B
K−1d
C
K−1Kd
D
dK−1
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Solution
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When in air , for each ball ,

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