Question

$\mathbf{a}.(\mathbf{a} \times \mathbf{b}) =$

• A. b . b
• B. $a^{2}b$
• C. 0
• D. $a^{2} + ab$

Answer 1

Answer: (C)

0

Answer 2

Since $\mathbf{a} \times \mathbf{b}$ is perpendicular to $\mathbf{a}$ and $\mathbf{b}$ both, therefore $\mathbf{a}.(\mathbf{a} \times \mathbf{b}) = 0.$

$(\because$Scalar product of two perpendicular vector is zero)