Some are important aspects about the charges as below
1. Like charges are always repel each other and unlike charges attract each other. Even attraction and repulsion takes place even in vacuum also.
2. The force between the charges obeys inverse square law and its magnitude depends on the medium in which charges are placed, the distance between them and also on the magnitude of the charges.
3. The electrostatic force is about 10^35 times stronger than gravitational force, therefore the gravitational force between masses can be usually neglected in comparison with the electrostatic forces.
4. Bodies can be charged by three methods i.e., friction, conduction and induction
5. When a positive charge is brought nearer to an uncharged conductor, then an equal and opposite charge will appear on the conductor on the side nearer, so that the conductor makes the positive charge as neutral nature of the conductor. This process is called induction.
6. Any excess charge given to a conductor, always resides on the outer surface of the conductor.
7. Charges cannot be changed due its motion.
8. The charge density tends to be very large on sharp points on an isolated conductor. Charge density is nothing bout charge per unit surface area.
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