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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. 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 at large distances decreases as the inverse *cube* of the distance. This is because the dipole has zero *net* charge. - 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 # 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. 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: - The number of dimensions involved changes the unit and terminology used: