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In a liquid medium of dielectric constant K and of specific gravity 2, two identically charged spheres are suspended from a fixed point by threads of equal lengths. The angle between them is 90^@. In another medium of unknown dielectric constant K^1, and specific gravity 4, the angle between them becomes 120^@. If density of material of spheres is 8 gm/cc then find K^1 |
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Answer» Solution :`F = W tan theta` i) `1/(4 pi epsilon_0) (q^2)/(K(2l^2)) =mg (1 - 2/8) Tan 45^@` ii) `1/(4 pi epsilon_0) (q^2)/(K^1 (3l^2)) = mg (1 - 4/8) Tan 60^@` i/ii gives `K^1 = K/(sqrt(3))` |
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