Q. Given $\overrightarrow{P} = 3\widehat{j} + 4\widehat{k}$ and $\overrightarrow{Q} = 2\widehat{i} + 5\widehat{k}$. The magnitude of the scalar product of these vectors is
A) 20
B) 23
C) 26
D) $5\sqrt{33}$
Explanation
(c) $\overrightarrow{P}.\overrightarrow{Q} = \left( 3\widehat{j} + 4\widehat{k} \right).\left( 2\widehat{i} + 5\widehat{k} \right) = 6 + 20 = 26$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.