Fleming's left hand rule
Fleming's left hand rule helps find the direction of force on a current-carrying conductor placed in a magnetic field.
Practice This ConceptMain explanation
Teacher explanation
Stretch the thumb, forefinger, and middle finger of the left hand so that they are mutually perpendicular. The forefinger shows the magnetic field direction, the middle finger shows current direction, and the thumb shows the direction of force or motion. This rule is very important in electric motors, where current and magnetic field interact to produce motion.
Example
If current flows in a conductor placed between magnet poles, the conductor experiences a force that makes it move in a specific direction.
Simple analogy
Field, current, force: left hand tells the push.
Common confusion
Students often use the right hand here or mix up the directions of current and force.
Exam tip
Remember the order: field, current, force. Left hand is used for force on current in a field.
Answer writing and exam use
1-mark use
Write the exact meaning of fleming's left hand rule in one clean line.
2-mark use
Define fleming's left hand rule and add one example or condition.
3-mark use
Explain fleming's left hand rule, show the method or example, and mention the common mistake.
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