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education/physics/PHYS2220/Electric Charge.md
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@@ -28,7 +28,7 @@ This means that to find the net force acting on a single charge, you add up all
An electric dipole consists of two point charges of equal magnitude but opposite sign. Many molecules behave like dipoles.
- **Electric dipole moment** ($p$) is defined as the product of the charge $q$ and the separation $d$ between the two charges making up the dipole. $p = qd$
- The dipole field at large distances decreases as the inverse *cube* of the distance. This is because the dipole has zero *net* charge.
- In an electric field, a dipole experiences a torque that aligns it with the field.
# Continuous Charge Distributions
It's largely impossible to sum the electric field from every particle in a piece of matter, so the approximation is made that the charge is spread continuously over the distribution.
- The number of dimensions involved changes the unit and terminology used: