Fleming’s rules can be define as
When a current-carrying conductor is place under a magnetic field, a force acts on the conductor. The direction of this force can be identify with Fleming’s Left Hand Rule.
Likewise,According to Fleming’s rules if a moving conductor is brought under a magnetic field. The electric current will be induce in that conductor.
Moreover, The direction of the induce current can be found using Fleming’s Right Hand Rule. 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.
In short there are two Fleming’s rules.
Fleming’s Left-Hand Rule is mainly applicable to electric motors and Fleming’s Right-Hand Rule is mainly applicable to electric generators.
Fleming’s Right-Hand Rule
According to Faraday’s law of electromagnetic induction, when a moving conductor is place inside a magnetic field, a current will be induced in it. If the conductor is forcefully move inside the magnetic field, there will be a relationship between the direction of applied force, magnetic field and the current. Moreover, This relation between these three directions is determine by Fleming’s right-hand rule.
As shown in the figure above, the right-hand rule requires you to
“Hold the right hand fore finger, middle finger and the thumb at right angles to each other. If the forefinger represents the direction of the magnetic field, the thumb points in the direction of motion or applied force, then the middle finger points in the direction of the induced current.”
Fleming’s Left-Hand Rule
When a current-carrying conductor is place in an external magnetic field, the conductor experiences a force perpendicular to both the field and to the direction of the current flow. A left hand can be held, as shown in the illustration, so as to represent three mutually orthogonal axes on the thumb, forefinger and middle finger.
The left-hand rule requires you to,
- “Hold out your left hand with the forefinger, second finger and thumb perpendicular to each other. If the forefinger represents the direction of the field and the second finger represents that of the current, then thumb gives the direction of the force.”
Difference Between Fleming’s Left-Hand and Right-Hand Rule
|Left-Hand Rule||Right-Hand Rule|
|the phenomena was invent by John Ambrose Fleming||This phenomena was invent by John Ambrose Fleming|
|It is use for electric motors||It is use for electric generators|
|The purpose of the rule is to find the direction of motion in an electric motor||The purpose of the rule is to find the direction of induce current when a conductor moves in a magnetic field.|
|thumb represents the direction of the thrust on the conductor||thumb represents the direction of motion of the conductor.|
|index finger represents the direction of the Magnetic Field||index finger represents the direction of the Magnetic Field|
|middle finger represents the direction of the current||middle finger represents the direction of the induced current|