Learn the difference between Fleming 's Left - Hand Rule and Right- Hand Rule with clear explanations, diagrams, and real-life applications. Understand how these rules work in motors and generators. Fleming ’s Left and Right Hand Rules – What is the Difference? John Ambrose Fleming introduced these useful rules in the late 19th century which are applicable in magnetism and electromagnetism. Both rules can be used to find the direction of the third quantity if the other two are known before. We know that when a current carrying conductor lays in a magnetic field, a mechanical force applies on the conductor. The direction of this applied force can be found through Fleming ’s left hand ... Fleming Left and Right Hand Rule - Here is a complete article based on Fleming 's Left and Fleming 's Right Hand Rule and how this rule works. Read and learn more at Careers360. Fleming’s left-hand rule tells us that if we stretch our thumb, middle finger and the index finger of our left hand in mutually perpendicular (make an angle of 90 degrees) directions to each other, we can see the relation between directions of force (F), current (I), and magnetic field (B).