Practicing Success
The distance of the plane $\vec{r} \cdot(2 \hat{i}-\hat{j}+\hat{k})=3$ from the origin is : |
$\frac{3}{\sqrt{6}}$ $\frac{\sqrt{3}}{2}$ $\frac{8}{\sqrt{6}}$ $\frac{1}{\sqrt{2}}$ |
$\frac{3}{\sqrt{6}}$ |
$\vec{r} . \underbrace{(2 \hat{i}-\hat{j}+\hat{k})}=3$ $\vec{r} . \hat{n}=d$ d → distance form origin So here $|\vec{n}|=\sqrt{4+1}+1=\sqrt{6}$ (not a unit vector) dividing equation by $|\vec{n}|$ $\vec{r} . \frac{(2 \hat{i}-\hat{j}+\hat{k})}{\sqrt{6}}=\frac{3}{\sqrt{6}}$ So $\frac{3}{\sqrt{6}}$ → distance from origin |