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JEE MAIN 2021
16-03-2021 S2
Question
Let $\vec{a}=\hat{i}+2 \hat{j}-3 \hat{k}$ and $\vec{b}=2 \hat{i}-3 \hat{j}+5 \hat{k}$ If $\vec{r} \times \vec{a}=\vec{b} \times \vec{r} \cdot(a \hat{i}+2 \hat{j}+\hat{k})=3$ and $\vec{r} \cdot(2 \hat{i}+5 \hat{j}-\alpha \hat{k})=-1, \alpha \in R$, then the value of $\alpha+|\overrightarrow{\mathrm{r}}|^2$ is equal to :
Select the correct option:
A
9
B
15
C
13
D
11
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Question Tags
JEE Main
Mathematics
Easy
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