JEE Main 2010 Physics question
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g , the angle remains the same. If density of the material of the sphere is 16 g , the dielectric constant of the liquid is
Answer: (3)
Solution
The angle is fixed by . In the liquid, the electric force becomes and the effective weight
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