1. This small group activity is designed to help students learn how to calculate the electrostatic potential field due to a distribution of discrete charges.
2. Students calculate the electrostatic potential field generated by a two charges using superposition and the definition of $|\Vec r - \Vec r'|$.
3. The wrap-up discussion addresses how the superposition principle is used and what $|\Vec r - \Vec r'|$ means geometrically in a specific problem.

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