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