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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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In Fleming’s Left Hand Rule, which finger represents the direction of the magnetic field?
Little finger
Thumb
First (index) finger
Middle finger
First (index) finger
Remember the mnemonic 'FBI' for Fleming's Left Hand Rule: F (Thumb/Force), B (Index/Magnetic Field), I (Middle/Current).
Remember the mnemonic 'FBI' for Fleming's Left Hand Rule: F (Thumb/Force), B (Index/Magnetic Field), I (Middle/Current).
Analyze Fleming's Left Hand Rule structure
Fleming's Left Hand Rule involves three fingers held at right angles to each other to determine the direction of force in an electric motor.
Map fingers to physical components
The thumb represents the direction of motion or Force (F), the First (index) finger represents the direction of the Magnetic field (B), and the middle finger represents the direction of the electric Current (I).
A: Little finger is not part of the rule's primary indicators. B: Thumb represents Force/Motion. D: Middle finger represents the direction of current.
C is correct because the First (index) finger is defined in Fleming's Left Hand Rule to represent the direction of the magnetic field.
For Right Hand Rule questions (Generator), the layout remains the same for the fingers, but it represents induced current rather than motor force.