Question

The electric force acting between two point charges kept at a certain distance in vacuum is $16N$. 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 _________$N$.

• A. 1024
• B. 128
• C. 16
• D. 2

Answer 1

Answer: (D)

Force acting between the charges placed in vacuum $F_0=16N$
Dielectric constant of medium $K=8$
Force acting between the charges placed in medium $F_m=\frac{F_0}{K}$
$\Rightarrow F_m=\frac{16}{8}=2N$