Fleming’s left-hand rule for magnet currents in physics 👈 Fleming’s left-hand rule is a mnemonic used in physics to predict the direction of force on a current-carrying conductor in a magnetic field. According to the rule, if you arrange your left hand with the thumb, forefinger, and middle finger all perpendicular to each other, the thumb represents the direction of the force (thrust), the forefinger represents the direction of the magnetic field, and the middle finger represents the direction