Physics-Scalar & Vector Products
NEET Physics Scalar & Vector Products MCQ Question
Type: MCQ-diagram based-Hard-Class 11
Imagine a diagram similar to Fig. 4.10, where two vectors A and B make an angle θ with each other. The resultant vector R is drawn using the parallelogram method. If SN is perpendicular to OP and PM is perpendicular to OS, which of the following expressions correctly represents the relationship between the magnitudes of vectors A, B, and R?
A
R^2 = A^2 + B^2 + 2AB cos θ
B
R = A + B sin θ
C
R = A^2 + B^2 - 2AB cos θ
D
R^2 = A^2 + B^2 - 2AB sin θ
Correct Answer
Option A
Detailed Explanation
The expression R^2 = A^2 + B^2 + 2AB cos θ is derived from the parallelogram law of vector addition, as described in the NCERT context.
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