Question

How do we know that there are two types of charges.

Answer 1

There are two types of electric charge: positive charge and negative charge. If the same amounts of negative and positive charge are found in an object, there is no net charge and the object is electrically neutral.

Answer 2

There are two types of electric charge: positive charge and negative charge. If the same amounts of negative and positive charge are found in an object, there is no net charge and the object is electrically neutral. The overall charge of an object is usually due to changes in the number of electrons.