Which of the following statements describes electric fields? electric potentials are caused by electric fields. electric fields are scalar values. electric charges produce electric fields. electric fields cannot exist in space.

The correct answer is

Electric charges produce electric fields.

In fact, electric fields are produced by electric charges. For instance, the electric field produced by a single-point charge is radial, and its intensity decreases as the inverse of the square of the distance from the charge, according to:

where k is the Coulomb's constant, q is the magnitude of the charge and r is the distance from the charge. If the charge is positive, the electric field points away from the charge; if the charge is negative, the electric field points toward the charge.

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