question_answer 36)

                  The component of a vector r along X-axis will have maximum value if                 (a) r is along positive Y-axis                 (b) r is along positive X-axis                 (c) r makes an angle of 45° with the x-axis                 (d) r is along negative Y-axis

Answer:

                  (b) Component of \[\vec{r}\] along x-axis \[=r\cos \theta \] where,  \[\theta \] is the angle made by \[\vec{r}\] with horizontal direction. \[\cos \theta =1\] (max.) If \[0={{0}^{o}}\].