The component of a vector $\vec{r}$ along $x$-axis will have maximum value if

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Professor PC Thomas Classes · Answer

(b) : If $\vec{r}$ makes an angle $	heta$ with $x$-axis, then component of $\vec{r}$ along $x$-axis $=r \cos 	heta$. It will be maximum if $\cos 	heta=1$ or $	heta=0^{\circ}$ i.e., $\vec{r}$ is along positive $x$-axis.