Two points charges are kept in air with a separation between them. The force between them is F 1 , if half of the space between the charges is filled with a dielectric constant 4 and the force between them is F 2 , if 
rd of the space between the charges is filled with dielectric of dielectric constant 9 . Then 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
When dielectric of thickness t is introduced in two charges at distance r, the effective force between the charges is given by
where, K = dielectric constant of medium
In first case, 
and 
In second case, 
and 
So, 
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