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. 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-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). Flemings hand rules are used for that. An English electrical engineer and physicist John Ambrose Fleming stated two rules in late 19th century to determine the direction of induced EMF and force acting on a current carrying conductor placed in a magnetic field. These rules popularly known as Flemings Left Hand Rule and Flemings Right Hand Rule .