Fleming’s Right and Left Hand rule we can find the direction of Magnetic Force, Magnetic Field and direction of current
Fleming’s Left-Hand Rule and Fleming’s Right-Hand Rule are essential rules applicable in magnetism and electromagnetism. John Ambrose Fleming developed them in the late 19th century as a simple way of working out the direction of electric current in an electric generator or the direction of motion in an electric motor. It is important to note that these rules do not determine the magnitude; instead show only the direction of the three parameters (magnetic field, current, force) when the direction of the other two parameters is known.
Fleming right-hand thumb rule:
When a conductor such as a wire attached to a circuit moves through a magnetic field, an electric current is induced in the wire due to Faraday's law of induction.
Fleming's right-hand rule (for generators) shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field.
- The thumb is pointed in the direction of the motion of the conductor relative to the magnetic field.
- The first finger is pointed in the direction of the magnetic field. (north to south)
- Then the second finger represents the direction of the induced or generated current within the conductor (from the terminal with lower electric potential to the terminal with higher electric potential, as in a voltage source)
Fleming’s Left-Hand Rule?
When a current-carrying conductor is placed in an external magnetic field, the conductor experiences a force perpendicular to both the field and the current flow’s direction. Fleming’s left-hand rule is used to find the direction of the force acting on the current carrying conductor placed in a magnetic field.
Finger | Right-hand rule | Left-hand rule |
Thumb | The direction of motion of conductor (input) | The direction of the conductor (output) |
Forefinger | Magnetic field | Magnetic field |
Middle finger | The direction of induced emf (output) | The direction of current (input) |
