DC Theory LMS Practice Test

In a generator, electromagnetic induction arises when a conductor moves through a magnetic field, producing a current. Fleming's Left-Hand Rule ties together three elements: the motion of the conductor, the direction of the magnetic field, and the direction of the induced current. If you point the thumb in the direction of the conductor’s motion, the forefinger from north to south, then the middle finger points in the direction of conventional current that is generated. This triple—motion, field direction, and current direction—is exactly what the left-hand rule uses to describe induction in generators. The other options describe aspects like resistance, power, or pole polarity, which are not about the direction of the induced current in this context.