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Q.

The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is

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a

1 : K

b

K : 1

c

1 : K2

d

K2 : 1

answer is B.

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Detailed Solution

Fa=q1q24πε0r2,  Fb=q1q2K4πε0r2⇒Fa : Fb=K : 1
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The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is