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  4. The electric force acting between two point charges kept at a certain distance in vacuum is 16 N. If the same two charges are kept at the same distance in a medium of dielectric constant 8 . The electric force acting between them is N.

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Q. The electric force acting between two point charges kept at a certain distance in vacuum is $16\, N$. If the same two charges are kept at the same distance in a medium of dielectric constant $8$ . The electric force acting between them is _________$N$.

Gujarat CETGujarat CET 2018

Solution:

Force acting between the charges placed in vacuum $F _{0}=16\, N$
Dielectric constant of medium $K =8$
Force acting between the charges placed in medium $F_{m}=\frac{F_{0}}{K}$
$\Rightarrow F _{ m }=\frac{16}{8}=2 N$