Which of the following rules is used to determine the force on a current carrying conductor kept inside a magnetic field?

Correct option is D

Fleming's Left-Hand Rule is used to determine the direction of force experienced by a current-carrying conductor placed in a magnetic field. According to this rule:

• Extend your left hand such that the thumb, forefinger, and middle finger are mutually perpendicular to each other.
• The forefinger points in the direction of the magnetic field, the middle finger indicates the direction of current, and the thumb gives the direction of the force (motion) acting on the conductor.

This rule applies to situations involving the motor effect, where a magnetic field and current interact to produce a mechanical force.

Key Facts (Exam-Oriented):

·         Fleming's Left-Hand Rule is specifically used for electric motors.

·         The force direction can be predicted only when the magnetic field and current directions are known.

·         This is a direct application of Lorentz force acting on a conductor.

·         Right-hand rules (like Fleming's Right-Hand Rule) are used for generators, not motors.

·         The force direction follows the concept of perpendicular interaction between current, magnetic field, and force.