According to Fleming’s right-hand rule, if the forefinger indicates the direction of magnetic field and thumb shows the direction of motion of conductor, then the stretched middle finger will predict the direction of

Fleming’s right-hand rule is a mnemonic used to determine the direction of induced current in a conductor moving through a magnetic field, a principle central to the operation of electric generators [2]. According to this rule, if the thumb, forefinger, and middle finger of the right hand are stretched mutually perpendicular to each other, the thumb represents the direction of motion of the conductor relative to the magnetic field, and the forefinger represents the direction of the magnetic field. Consequently, the middle finger points in the direction of the induced current [3]. This differs from Fleming's left-hand rule, which is used for electric motors to find the direction of force (thrust) acting on a current-carrying conductor [3]. Therefore, in the context of the right-hand rule, the middle finger specifically predicts the induced current.

Sources

1. [1] https://en.wikipedia.org/wiki/Fleming%27s_right-hand_rule
2. [2] https://en.wikipedia.org/wiki/Fleming's_rules
3. [3] https://moodle.weltec.ac.nz/mod/book/tool/print/index.php?id=244070&chapterid=52229