Fleming's left-hand rule for motors

Fleming's Left Hand Rule This rule, similiarly to Fleming's right hand rule describes the action of an object in an electric or magnetic field. Similiarly to the right hand rule, the left hand should be extended. The thumb should be in the positive y-axis, the index finger in the positive z-axis, and the middle finger in the positive x-axis. We define positive y as up from the ground, positive x as towards your right, and positive z as away from your body.

The thumb represents motion, the direction in which the object is currently travelling.

The first finger represents the field (physics)field of the system we are looking at.

The second finger represents the current in which is induced into the system in which are looking at.

Generally provided in questions about this will be the direction of the motion and the field of the system. This is used to show how we can use generators and can also be used to show that we do not get an infinite positive feedback system from them.

This mnemonic is named after British engineer John Ambrose Fleming, who invented it.