Question

A force ‘F’ is acting between two charges in air. If the space between them be completely filled with a medium , the force will be :

A

B

C

D

Easy

Solution

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Correct option is C)

By Coulomb's law, the force between two charges in air is given by  
where distance between two charges.
Now the force between two charges in medium with dielectric constant becomes,
So,

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