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Q.

The electrostatic force between two point charges kept with a separation in air is 6.3×10−3N . If half of the space between the charges is filled with a dielectric of dielectric constant 4, the electrostatic force between the two charges is 

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a

6.3×10−3N

b

5.6×10−3N

c

2.8×10−3N

d

4.2×10−3N

answer is B.

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Detailed Solution

F∝1r2 

r'=r+t(K-1)=3r2

F'=Frr'2=49×6.3×10-3 =2.8×10-3 N

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