The plane $\vec{r} . \vec{n}=q$ will contain the line $\vec{r}=\vec{a} \times \lambda \vec{b}$, provided:
Answer & explanation
Correct answer: option 3
We must have
$\vec{b} . \vec{n}=0$ and $\vec{a} . \vec{n}=q$
Hence (3) is correct answer.
The plane $\vec{r} . \vec{n}=q$ will contain the line $\vec{r}=\vec{a} \times \lambda \vec{b}$, provided:
Correct answer: option 3
We must have
$\vec{b} . \vec{n}=0$ and $\vec{a} . \vec{n}=q$
Hence (3) is correct answer.