Question

Two vectors $P=2\hat{i}+b\hat{j}+2\hat{k}$ and $Q=\hat{i}+\hat{j}+\hat{k}$ will be parallel if

• A. $b=0$
• B. $b=1$
• C. $b=2$
• D. $b=-4$

Answer 1

Answer: (C)

$b=2$

$P$ and $Q$ will be parallel if $\frac{2}{1}=\frac{b}{1}=\frac{2}{1}\therefore b=2$