Which of the following laws deduces the expression for the force between two stationary point charges in vacuum or free space?

​The correct answer is Coulomb’s Law.

Key Points

• Coulomb’s Law talks about the magnitude of the attraction between the two charges.
  • It says that the force is directly proportional to the product of the quantity of the two charges.
  • F ∝ q1q2, where (F is Force, q1 and q2 are charges).
  • It is also inversely proportional to the square of the distance between them.
• i.e., F ∝ 1/r2 where (F is Force, r is the distance between the charges).
• Thus, the equation is
• \(F\; = \;k\frac{{{q_1}{q_2}}}{{{r_2}}}\;\)where k is the proportionality constant and is equal to 9 × 109 Nm2/C2.
• The Law was given by Charles-Augustin de Coulomb in the year 1784.

Additional Information

• Lenz's law states that the direction of the induced current in the coil will be always in such a way that it opposes the change which produces the current.
• According to Gauss law, the total electric flux linked with a closed surface called Gaussian surface is \(\frac{1}{ϵ_o}\) the charge enclosed by the closed surface.
• Ohm’s law states that at a constant temperature, the current through a conductor between two points is directly proportional to the voltage across the two points.