A) remains unchanged
B) decreases K times
C) increases K times
D) increases K2 times
Correct Answer: B
Solution :
When a dielectric medium is completely filled in between charges, rearrangement of the charges inside the dielectric medium takes place and the force between the same two charges decreases by a factor of K ie, \[{{F}_{med}}=\frac{{{F}_{air}}}{K}=\frac{1}{4\pi {{\varepsilon }_{0}}K}\frac{{{Q}_{1}}{{Q}_{2}}}{{{r}^{2}}}\] (Here,\[{{\varepsilon }_{0}}K={{\varepsilon }_{0}}{{\varepsilon }_{r}}=\varepsilon =\]permitivity of medium)
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