If \(\vec{a}\) is a nonzero vector of magnitude \(a\) and \(\lambda\) is a nonzero scalar, then \(\lambda \vec{a}\) is unit vector if
Answer & explanation
Correct answer: option 4
\(\begin{aligned}|\lambda \vec{a}|&=1\\ |\lambda ||\vec{a}|&=1\\ |\vec{a}|&=\frac{1}{|\lambda|}\end{aligned}\)