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education/physics/PHYS2220/Electric Charge.md
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@@ -27,4 +27,6 @@ This means that to find the net force acting on a single charge, you add up all
# The Electric Dipole # The Electric Dipole
An electric dipole consists of two point charges of equal magnitude but opposite sign. Many molecules behave like dipoles. 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. $p = qd$ - **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 - The dipole field at large distances decreases as the inverse *cube* of the distance. This is because the dipole has zero *net* charge.
# Continuous Charge Distributions