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Question

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 15 900. in another medium of unknown dielectric constantK1 , and specific gravity 4 the angle between them becomes 1200if density of material of spheres is 8 gm/cc. then k1 is :

A
k2
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B
3k
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C
32k
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D
k3
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Solution

The correct option is D k3
tan450=14πE0k.q22l2(82)vg..................(1)tan600=14πE0k.q23l2(84)vg..................(2)13=kk32.46k=k3
Option D is correct.

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