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Fleming’s Left Thumb Rule Statement

Fleming’s Left Thumb Rules: When a current-carrying conductor is exposed to an external magnetic field, it is subjected to a force that is perpendicular to both the field and the direction of the current flow. The direction of the force exerted on a current carrying conductor in a magnetic field is determined using Fleming’s left-hand rule.

Fleming’s Left Hand Rule for Class 10

According to Fleming’s Left Hand Rule, if we arrange our left-hand thumb, forefinger, and middle finger perpendicular to each other, the thumb points to the direction of the force experienced by the conductor, the forefinger to the direction of the magnetic field, and the middle finger to the direction of the electric current.

Fleming’s Left Hand Rule Questions

The operation of an electric motor is one of the most typical and well-known implementations of Fleming’s left-hand rule. Let’s have a look at how an electric motor works:

  • When an electric current passes through a conductor, a cylindrical magnetic field forms around the conductor. The magnetic field and the electromagnetic field interact when an external magnetic field is brought close to the current-carrying conductor.
  • A physical force will result from the interplay of current and magnetic fields.
  • We apply this rule to determine the force’s direction. The thumb of our left hand will point in the direction of the force if the middle finger of our left hand represents the direction of the current and the forefinger represents the direction of an external magnetic field.
  • In a conventional DC electric motor, the electromagnetic field interacts with the permanent magnets’ magnetic field, resulting in the generation of a physical force.
  • We can identify the direction of this force and the direction of the motor’s motion using this rule.
  • It can be utilised to more easily comprehend the motion of any of the many distinct types of electric motors.

 

Difference in Fleming’s Left-Hand and Right-Hand Rules

There will be a force acting on a current carrying conductor whenever it comes into contact with a magnetic field. Fleming’s Left Hand Rule (also known as ‘Flemings left-hand rule for motors’) can be used to determine the direction of this force. The direction of motion of the electric motor is determined by this law.

Similarly, if a conductor is pulled into a magnetic field by force, an induced current will flow through it. Fleming’s Right Hand Rule can be used to determine the direction of this force. In an electric generator, this law is used to identify the direction of induced current.

Both of the Laws or rules were given by John Ambrose.

Fleming’s Left Hand Rule is Applied To the

  • Fleming’s left and right-hand rule was created by John Ambrose Fleming in the late 1800s.
  • When the magnetic field direction and current direction are known, Fleming’s Left-Hand Rule is a simple and accurate approach to find the conductor’s direction of force/motion in an electric motor.
  • The thumb, forefinger, and middle finger of the left hand are stretched perpendicular to each other in the following manner:
    1. Thrust (or force) on the conductor is indicated by the thumb.
    2. The direction of the Magnetic Field is shown by the forefinger.

Fleming’s Left Hand Rule is Used to Find

  • The direction of the current is indicated by the centre (middle) finger.
  • In an electric motor, the left-hand rule is employed to denote the direction of motion.
  • There is a relationship between the magnetic field, current, and force in both Fleming’s left and right hand rules. Fleming’s left hand rule and Fleming’s right hand rule, respectively, define the direction of this relationship.
  • When the direction of the other two parameters (magnetic field, current, and force) is known, these rules show the direction of any of the three parameters (magnetic field, current, and force).
  • The Left-Hand rule applies mostly to electric motors, while the Right-Hand rule applies primarily to electric generators.

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FAQs about Fleming’s Left Hand Rule

Q. What is Fleming’s left hand rule used for?

Ans. A current-carrying conductor is subjected to a force that is perpendicular to both the field and the current flow direction when it is exposed to an external magnetic field. Fleming’s left-hand rule is used to identify the direction of force exerted on a current carrying conductor in a magnetic field.

Q. State the Fleming’s left hand rule.

Ans. According to Fleming’s Left Hand Rule, if we place our thumb, forefinger, and middle finger of the left hand perpendicular to each other, the thumb points towards the magnetic force, the forefinger points towards the magnetic field, and the middle finger points towards the current direction.

Q. State the Fleming’s Right hand rule.

Ans. According to Fleming’s Right Hand Rule, if we place our right-hand thumb, forefinger, and middle finger perpendicular to each other, the thumb points towards the magnetic force, the forefinger points towards the magnetic field, and the middle finger points towards the current direction.

Q. What is the use of different fingers in Fleming’s left hand rule?

Ans. The thumb, forefinger, and middle finger of the left hand are stretched perpendicular to each other in the following manner, as Thrust (or force) on the conductor is indicated by the thumb; The direction of the Magnetic Field is shown by the forefinger; The direction of the current is indicated by the centre (middle) finger.

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