What effect is demonstrated when a current-carrying conductor experiences a force in a magnetic field?

The phenomenon demonstrated when a current-carrying conductor experiences a force in a magnetic field is known as the motor effect. This effect occurs when a magnetic field interacts with an electric current, causing the conductor to move. The principle behind the motor effect is described by the Lorentz force law, which states that a charged particle moving through a magnetic field will experience a force perpendicular to both the direction of the current and the magnetic field.

This effect is fundamental to the operation of electric motors, where coils of wire carrying current produce motion due to their interaction with magnetic fields. The direction of the force can be determined using Fleming's Left-Hand Rule, which helps visualize the relationships between current, magnetic fields, and motion.

The other options relate to different phenomena: induction effect refers to the generation of voltage across a conductor in a changing magnetic field; electromagnetic effect is a broader term that encompasses phenomena related to electric and magnetic fields but does not specifically indicate the force on a conductor; the electrostatic effect deals with stationary charges and their electric fields and does not involve motion caused by current. Therefore, the motor effect is the precise and correct term for the scenario described.