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Potential Difference

The potential difference between two points is the change in the potential energy per unit charge as the charge tends to zero.
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Principle of Superposition of Potentials

If there are a number of point charges Q1, Q2, …, Qn, located at position vectors Description: 25926.png respectively then the potential at the point Description: 31348.png is,

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Potential due to Continuous Charge Distribution

If the charge distribution is continuous, the potential at a point P can be found by summing over the contributions from individual differential elements of charge dq.

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