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JEE ADVANCE 2019
paper 1
Multiple correct answers - Select all that apply
Question
Let $\mathrm{L}_1$ and $\mathrm{L}_2$ denotes the lines $$ \begin{aligned} & \overrightarrow{\mathrm{r}}=\hat{\mathrm{i}}+\lambda(-\hat{\mathrm{i}}+2 \hat{\mathrm{j}}+2 \hat{\mathrm{k}}), \lambda \in \mathbb{R} \text { and } \\ & \overrightarrow{\mathrm{r}}=\mu(2 \hat{\mathrm{i}}-\hat{\mathrm{j}}+2 \hat{\mathrm{k}}), \mu \in \mathbb{R} \end{aligned} $$ respectively. If $\mathrm{L}_3$ is a line which is perpendicular to both $\mathrm{L}_1$ and $\mathrm{L}_2$ and cuts both of them, then which of the following options describe(s) $\mathrm{L}_3$ ?
Select ALL correct options:
A
$\overrightarrow{\mathrm{r}}=\frac{1}{3}(2 \hat{\mathrm{i}}+\hat{\mathrm{k}})+\mathrm{t}(2 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}-\hat{\mathrm{k}}), \mathrm{t} \in \mathbb{R}$
B
$\overrightarrow{\mathrm{r}}=\frac{2}{9}(2 \hat{\mathrm{i}}-\hat{\mathrm{j}}+2 \hat{\mathrm{k}})+\mathrm{t}(2 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}-\hat{\mathrm{k}}), \mathrm{t} \in \mathbb{R}$
C
$\overrightarrow{\mathrm{r}}=\mathrm{t}(2 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}-\hat{\mathrm{k}}), \mathrm{t} \in \mathbb{R}$
D
$\overrightarrow{\mathrm{r}}=\frac{2}{9}(4 \hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}})+\mathrm{t}(2 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}-\hat{\mathrm{k}}), \mathrm{t} \in \mathbb{R}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
⚠ Partially correct. Some answers are missing.
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