Electric Field of a Dipole

How is an electret, a permanent electrostatic magnet, typically formed?

• By rubbing two different materials together to transfer electrons.

• By applying high voltage to a molten insulator, then allowing it to solidify.

• By exposing a conductor to a strong magnetic field.

• By inducing charge separation in a material through friction.

What method is used to determine the net electric field at any point around an electric dipole?

• Scalar addition of the magnitudes of the individual electric fields.

• Vector addition of the electric field vectors from each charge.

• Averaging the electric field strengths of the positive and negative charges.

• Multiplying the electric field magnitudes of the two charges.

Which of the following correctly describes the essential properties of a vector quantity, such as an electric field?

• Only magnitude.

• Only direction.

• Both magnitude and direction.

• Neither magnitude nor direction.

How does the strength of an electric field change as the distance from a single point charge increases?

• It increases proportionally to the distance.

• It decreases proportionally to the distance.

• It decreases with the square of the distance.

• It remains constant regardless of the distance.