Question

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

• A. $\vec{r}$ is along positive $y$ -axis
• B. $\vec{r}$ is along positive $x$ -axis
• C. $\vec{r}$ makes an angle of $45^?$ with the $x$-axis
• D. $\vec{r}$ is along negative $x$ -axis

Answer 1

Answer: (B)

$\vec{r}$ is along positive $x$ -axis

Answer 2

The component of $r =E \cos \theta$
which is maximum when $\theta=0^{\circ}$
So, $r$ will be along positive $X$ -axis for maximum value.