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The relation between any two quantities in Flemings right-hand rules is ________
Same direction
Opposite direction
Perpendicular
Unrelated
Perpendicular
Quick Trick: Remember the 3-finger rule: Thumb, Forefinger, and Center finger are all held at 90-degree angles to each other, making the relationship between any two quantities strictly perpendicular.
Remember the 3-finger rule: Thumb, Forefinger, and Center finger are all held at 90-degree angles to each other, making the relationship between any two quantities strictly perpendicular.
Identify the quantities involved
Fleming's Right-Hand Rule involves three key physical quantities: Motion/Force (represented by the Thumb), Magnetic Field (represented by the Forefinger), and Induced Current (represented by the Middle/Center finger).
Analyze the spatial orientation
When applying the rule, the thumb, forefinger, and middle finger are stretched such that they are mutually perpendicular to one another. The angle between any two adjacent fingers is 90 degrees.
Determine the relation between any two quantities
Since all three quantities are mutually at 90 degrees to each other, the relationship between any pair chosen among them (Field & Motion, Motion & Current, or Field & Current) is strictly perpendicular.
A: Incorrect because the quantities are at 90 degrees to each other, not parallel/same direction. B: Incorrect because opposite direction implies 180 degrees, whereas the orientation is 90 degrees. D: Incorrect because the rule specifically relates the directions of field, motion, and induced current strictly through mutually perpendicular axes.
C is correct because Fleming's Right-Hand Rule requires the thumb, forefinger, and middle finger to be stretched mutually perpendicular (at 90 degrees) to one another.
In vector-based exam questions (like Lorentz force or hand rules), any 'three-finger rule' always signifies a mutually perpendicular (90 degree) 3D coordinate frame (X, Y, Z axes).