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Two charges - q and +q are located at po...

Two charges - q and +q are located at points (0, 0, - a) and (0,0, a), respectively.
Obtain the dependence of potential on the distance r of a point from the origin when `r/a gt gt 1`.

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The given charges behave as an electric dipole and the dipole length is 2a, hence dipole moment `p = q.2a`.
If `r/a gt gt 1 or r gt gt a `, then electric potential due to the dipole is inversely proportional to `r^2` i.e., `1/r^2`.
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U-LIKE SERIES-ELECTROSTATIC POTENTIAL AND CAPACITANCE -ADDITIONAL EXERCISES
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