The branch of Physics which deals with the study of electric charges is called electricity. There are two branches of electricity. They are electrostatics and electrodynamics.
Electrostatics is branch of Physics which deals with the study of electric charges at rest or charges which are not in motion or electric charges which are stationary. Electrodynamics is the branch of Physics which deals with the study of electric charges in motion.
Electric Charge
It is a fundamental and main property of matter. It can never be isolated from matter. There are two types of electric charge. One is positive charge and another is negative charge.
Positive Charge
Positive Charge showed the deficiency of electrons from a body or particle. A glass rod gets positively charged on rubbing it with silk. The mass of body decreases when the body acquired positive charge.
Negative Charge
Negative Charge showed the excess of electrons on the body or particle. When the negative charge is provided somewhat the mass of body increases. When an ebonite rod is rubbed with fur, it get negative charged. The main cause for production of charges is according to law of conservation of electric charge. According to this law, there will production of two opposite and equal charges. The net charge on the neutral body is zero and is equal to the sum of positive and negative electric charges.
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