In Fleming's left rule, the middle finger represents ________________.

CONCEPT:

• Fleming Left-hand rule gives the force experienced by a charged particle moving in a magnetic field or a current-carrying wire placed in a magnetic field.
  • This rule was originated by John Ambrose Fleming.
  • It is used in an electric motor.
  • It states that "stretch the thumb, the forefinger, and the central finger of the left hand so that they are mutually perpendicular to each other. If the forefinger points in the direction of the magnetic field, the central finger points in the direction of motion of charge, then the thumb points in the direction of force experienced by positively charged particles."

EXPLANATION:

• In Fleming's left rule, the middle finger represents the direction of current flowing through the conductor. So option 3 is correct.
• The thumb represents the direction of the magnetic force.
• The forefinger represents the direction of the magnetic field.