Q. ($\overrightarrow{P} + \overrightarrow{Q}$) is a unit vector along $X$-axis. If $\overrightarrow{P} = \widehat{i} - \widehat{j} + \widehat{k},$ then what value is $\overrightarrow{Q}?$
A) $\widehat{i} + \widehat{j} - \widehat{k}$
B) $\widehat{j} - \widehat{k}$
C) $\widehat{i} + \widehat{j} + \widehat{k}$
D) $\widehat{j} + \widehat{k}$
Explanation
(b) $\overrightarrow{P} + \overrightarrow{Q} = \widehat{i}$
$\overrightarrow{Q} = \widehat{i} - \widehat{i} + \widehat{j} - \widehat{k}$
$= \widehat{j} - \widehat{k}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.