Physics · Electrostatic Potential

For a point dipole, the electric potential falls off at large distance as \( 1/r^2 \), whereas for a single point charge it falls off as \( 1/r \). What is the potential decay power of distance for a quadrupole?

1. A
   \( 1/r \) / \( 1/r \)
2. B
   \( 1/r^2 \) / \( 1/r^2 \)
3. C
   \( 1/r^3 \) / \( 1/r^3 \)
4. D
   \( 1/r^4 \) / \( 1/r^4 \)