Electric charge

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There are only two types of electric charge (positive and negative). These charges are equal in size, but different in character. They are denoted as positive and negative. A charge exist between any two objects that have a net charge.

With electric charges, like charges repel each other, and unlike charges attract each other.

The unit of charge is called a Coulomb. The protons have a positive charge, while the electrons have a negative charge. The protons positive charge is equal in size to the electrons.