Class 12 Physics - Chapter 1: Electric Charges and
Fields
1. Electric Charge:
Electric charge is a fundamental property of matter. It can be positive or negative. SI unit is
Coulomb (C).
2. Properties of Charge:
1. Quantization: q = ne
2. Conservation: Total charge remains constant
3. Additivity: Charges add algebraically
, 3. Coulomb’s Law:
Force between two charges: F = k(q1q2/r²). It acts along the line joining the charges.
4. Electric Field:
Electric field is the force per unit charge: E = F/q. Unit: N/C.
Fields
1. Electric Charge:
Electric charge is a fundamental property of matter. It can be positive or negative. SI unit is
Coulomb (C).
2. Properties of Charge:
1. Quantization: q = ne
2. Conservation: Total charge remains constant
3. Additivity: Charges add algebraically
, 3. Coulomb’s Law:
Force between two charges: F = k(q1q2/r²). It acts along the line joining the charges.
4. Electric Field:
Electric field is the force per unit charge: E = F/q. Unit: N/C.
