Discussion
The potential of a dipole varies with distance as
Answer: D
Correct answer: the inverse square
The two charges of a dipole nearly cancel, so their potentials nearly cancel too, and what survives falls off one power faster than a single charge - as \( 1/r^2 \) rather than \( 1/r \). The field, being the gradient, falls faster still, as \( 1/r^3 \).
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