electric charge
From Physics wiki
The atoms that constitute everyday matter are composed of nuclei which are surrounded by electrons. These are held together by an electric force. The nucleus is said to have positive charge while the electrons are said to have negative charge. We know from experiment that unlike charges attract, while like charges repel[1]. That is to say, positively charged objects experience a repulsive force away from other positively charged objects, and an attractive force towards other negatively charged objects.
The amount of charge held by an object is measured by the SI unit of charge, the Coulomb, denoted by the symbol 
.
Most things have an equal amount of positive and negative charge, and are said to be neutral, and are (largely) unaffected by electric forces.
on to Coulomb's law
References
- ↑ Historically, we defined positive or negative charges by choosing one charged object as a reference, and determining which objects attract, repel or are unaffected by that object.
