1. Tardigrade
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  4. 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 gcm -3, the angle remains the same. If density of the material of the sphere is 1.6 gcm -3, the dielectric constant of the liquid is

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Q. Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of $30^{\circ}$ with each other. When suspended in a liquid of density $0.8\, gcm ^{-3}$, the angle remains the same. If density of the material of the sphere is $1.6\, gcm ^{-3}$, the dielectric constant of the liquid is

Solution:

$K=\frac{d_{S}}{d_{s}-d_{l}}=\frac{1.6}{0.8}=2$