Coulomb's law ಕನ್ನಡ ದಲ್ಲಿ 2nd PUC Physics Karnataka

2d PUC Physics Coulomb's law - Chapter-1 : Electric Charges and Fields
What Is Coulomb’s Law?
According to Coulomb’s law, the force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. It acts along the line joining the two charges considered to be point charges.
Coulomb’s Law Formula
Where,
ε is absolute permittivity,
K or εr is the relative permittivity or specific inductive capacity
ε0 is the permittivity of free space.
K or εr is also called a dielectric constant of the medium in which the two charges are placed.
Key Points on Coulomb’s Law
1. If the force between two charges in two different media is the same for different separations,
2. Kr2 = constant or K1r12 = K2r22
3. If the force between two charges separated by a distance ‘r0’ in a vacuum is the same as the force between the same charges separated by a distance ‘r’ in a medium, then from Coulomb’s law, Kr2 = r02
4. Two identical conductors having charges q1 and q2 are put to contact and then separated, after which each will have a charge equal to (q1 + q2)/2. If the charges are q1 and -q2, each will have a charge equal to (q1 - q2)/2.
5. Two spherical conductors having charges q1 and q2 and radii r1 and r2 are put to contact, and then separated the charges of the conductors after contact is
q1 = [r1/(r1 + r2)] (q1 + q2) and q2 = [r2/(r1 + r2)] (q1 + q2)
6. If the force of attraction or repulsion between two identical conductors having charges q1 and q2 when separated by a distance d is F. Also, if they are put to contact and then separated by the same distance, the new force between them is:

7. If charges are q1 and -q2, then F = F(q1 + q2)2 / 4q1q2
8. Between two electrons separated by a certain distance: Electrical force/Gravitational force = 1042
9. Between two protons separated by a certain distance: Electrical force/Gravitational force = 1036
10. Between a proton and an electron separated by a certain distance: Electrical force/Gravitational force = 1039
11. The relationship between the velocity of light, the permeability of free space and the permittivity of free space is given by the expression c = 1 / √ (μoεo )