743PhysicsMedium
When two charges are placed in water then the Coulomb force between them reduces to _____________?
A1/78 times
B1/2 times
C1/58 times
D1/3 times
Correct answer
A. 1/78 times
Explanation
The Coulomb force between two charges in a medium is given by Coulomb’s law, which states that the force is inversely proportional to the dielectric constant (relative permittivity) of the medium. Water has a high dielectric constant, which significantly reduces the Coulomb force between the charges. The dielectric constant of water is approximately 78. Therefore, the Coulomb force between two charges placed in water is reduced to: C. 1/78 times