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Which of the following rules is used to determine the direction of the force on a current- carrying conductor in an electric motor?
Fleming’s Right-Hand Rule
Ampere's Law
Right-Hand Thumb Rule
Fleming’s Left-Hand Rule
Fleming’s Left-Hand Rule
Remember the mnemonic: Motor uses Left Hand (M-L), Generator uses Right Hand (G-R).
Remember the mnemonic: Motor uses Left Hand (M-L), Generator uses Right Hand (G-R).
Step 1: Understand the Device Function
An electric motor converts electrical energy into mechanical energy by passing current through a magnetic field to produce motion.
Step 2: Apply Fleming's Left-Hand Rule
According to Fleming's Left-Hand Rule, stretch the thumb, forefinger, and middle finger of your left hand mutually perpendicular to each other. If the forefinger points in the direction of the magnetic field and the middle finger in the direction of current, the thumb points in the direction of force (motion) acting on the conductor.
A: Fleming's Right-Hand Rule is used for electromagnetic induction in electric generators and dynamos. B: Ampere's Law relates the integrated magnetic field around a closed loop to the electric current passing through the loop. C: Right-Hand Thumb Rule determines the direction of the magnetic field around a current-carrying wire.
D is correct because Fleming's Left-Hand Rule is universally applied to determine the direction of force acting on a current-carrying conductor inside an electric motor.
Never confuse motor rules with generator rules in physics questions: Motors use Left Hand, while Generators use Right Hand.
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