Final answer:
The center finger in the left-hand generator rule points to the direction of the induced current, which is determined by aligning the fingers to the magnetic field and conductor movement.
Step-by-step explanation:
When using the left-hand generator rule, the center finger points to the direction of the induced current. This rule is a method to determine the direction of induced current when a conductor moves through a magnetic field. The left hand is arranged such that the forefinger points in the direction of the magnetic field (B), the thumb points in the direction of the motion of the conductor (velocity, v), and consequently, the center (middle) finger will point in the direction of the induced current (I).
For example, if a conductor moves upwards through a magnetic field that is directed into the page (perpendicular to the plane of the page), align the thumb of the left hand upward for the motion of the conductor, the forefinger into the page for the magnetic field, and then the middle finger will point in the direction of the induced current, which would be in this case, from left to right across the conductor.