If \( \vec{r}=0.2 \hat{i}+a \hat{j}-0.3 \hat{k} \) is a unit vector, the value of \( a \) is....

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If \( \vec{r}=0.2 \hat{i}+a \hat{j}-0.3 \hat{k} \) is a unit vector, the value of \( a \)
\( \mathrm{P} \)
is
W
(1) \( \sqrt{0.87} \)
(2) 0.87
(3) 1.13
(4) \( \sqrt{1.13} \)


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