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education/physics/PHYS2220/Electric Charge.md
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The superposition principle states that: The superposition principle states that:
> The net force acting on a point charge is equal to the sum of all individual forces. > The net force acting on a point charge is equal to the sum of all individual forces.
This means that to find the net force acting on a single charge, you add up all of the individual forces acting on that charge. This means that to find the net force acting on a single charge, you add up all of the individual forces acting on that charge.
# The Electric Dipole
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