electric charges and fields

Folie 1

• state and explain coulomb's inverse square law in electricity.
• soln:coulomb's law: the force of attraction or repulsion between two stationary electric charges is directly proportional to the product of the magnitudes of two charges and inversely proportional to the square of the distance between them. the force acts along the line joining the two charges.
• explanation: consider two point charges q1 and q2 and seperated by the distance 'r' in air or vacuum. F is the force of attraction or repulsion between them.
• F∝q1q2 F∝1/r^2 = F∝q1q2/r^2 ε0
• q1 <---------------------------------->q2 π
• r^2
• F=1/4πε0