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Study Notes
- An electric dipole consists of equal and opposite point charges separated by a distance 2a.
- The direction from -q to q is the direction of the dipole.
- The total charge of the electric dipole is zero.
- The electric fields due to the charges do not exactly cancel out but nearly cancel out at large distances.
- The electric field due to a dipole falls off faster than like 1/r^2 at large distances.
- The electric field of the pair of charges can be found using Coulomb's law and the superposition principle.
- The electric field is simple to calculate when the point is on the dipole axis or in the equatorial plane.
- The electric field at any general point is obtained by adding the electric fields due to the charges.
- The electric fields are added using the parallelogram law of vectors.
- The mid-point of locations of -q and q is called the centre of the dipole.
Test your knowledge on electric dipoles and their properties with this quiz! Learn about the direction and total charge of electric dipoles, as well as how the electric fields due to the charges cancel out at large distances. Discover how to calculate the electric field of a dipole using Coulomb's law and the superposition principle, and how to apply the parallelogram law of vectors to add electric fields. Don't forget to brush up on the terminology, such as the dipole axis and
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