1.1 ELECTROMOTIVE FORCE, POTENTIAL AND VOLTAGE
Charge is the attribute of matter that is responsible for a force of interaction between two pieces of matter under certain conditions. Such an attribute was seen to be necessary as a result of experiments in the past which revealed the existence of a certain kind of interaction force between particles that could not be explained by other known sources of interaction forces.
Charge is bipolar. Two positively charged particles or two negatively charged particles repel each other. Two particles with charges of opposite polarity attract each other. Further, charge comes in integral multiples of a basic unit –the basic unit of charge is the charge of an electron. The value of electronic charge is –1.602 ...
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