Electric Fields

Electric Charges

Electric charge comes in two kinds:

Like charges repel:


Unlike charges attract:

These electric charges are part of the makeup of atoms.

This may be a better "picture" or model of an atom:

Except for hydrogen, the positively charged nucleus also has neutrons in it.

An atom missing an electron has a net positive charge:

Such an atom, missing an electron, is called an ion -- a positive ion.

At atom with one too many electrons has a net negative charge and is also called an ion -- a negative ion.

Hmwk Assignment

Insulators & Conductors

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(c) Doug Davis, 2002; all rights reserved