Question

A force F acts between sodium and chlorine ions of salt (sodium chloride) when put 1 cm apart in air. The permittivity of air and dielectric constant of water are ${\epsilon }_0$ and K respectively. When a piece of salt is put in water electrical force acting between sodium and chlorine ions 1 cm apart is

• A. $\frac{F}{K}$
• B. $\frac{FK}{{\epsilon }_0}$
• C. $\frac{F}{K{\epsilon }_0}$
• D. $\frac{F{\epsilon }_0}{K}$

Answer 1

The correct option is A $\frac{F}{K}$

When put 1 cm apart in air, the force between Na and Cl ions = F. When put in water, the force between Na and Cl ions $\frac{F}{K}$