1. Conversely, a charge distribution can be approximated by many small point charges . 2. Point particles with electric charge are referred to as point charges . 3. However, this is only the potential for one point charge due to another. 4. This principle is useful to calculate the field created by multiple point charges . 5. For example, consider the electric field arising from a single, isolated point charge . 6. We now introduce a fixed point charge " Q " at the origin. 7. The " relativistically-correct " electric field of a point charge varies with velocity as: 8. Electrons and nuclei are, to a very good approximation, point charges and point masses. 9. The electron itself, as far as anyone knows, is a point charge / point mass. 10. This is wise policy, as the energy of a point charge , is in fact, infinite.
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