Physics Vectors & Equilibrium PMDC Conceptual Practice
PMDC Verified Question 7 of 50
The direction of a vector product (cross product) is determined by which of the following rules?
A
Head-to-tail rule
B
Right-hand rule
C
Left-hand rule
D
Fleming's left-hand rule
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Right-hand rule
Concept:
Finding the orientation of the cross-product vector.

Solution:
The direction of \(\vec{C} = \vec{A} \times \vec{B}\) is perpendicular to the plane containing vectors \(\vec{A}\) and \(\vec{B}\). This direction is uniquely determined by the Right-hand rule: curl the fingers of your right hand from the first vector \(\vec{A}\) to the second vector \(\vec{B}\) through the smaller angle; your extended thumb will point in the direction of the product vector \(\vec{C}\).

Why other options are incorrect:
  • A is incorrect because the head-to-tail rule is used for vector addition, not multiplication.
  • C and D are incorrect because left-hand rules do not define standard vector cross-product conventions in mathematics.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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