Question

Let $\vec{a}, \vec{b}, \vec{c}$ be three vectors having magnitudes 1, 1 and 2 respectively. If $\vec{a}\times(\vec{a}\times\vec{c})+\vec{b}=\vec{0}$, then the angle between $\vec{a}$ and $\vec{c}$ is

• A. $\frac{\pi}{6}$
• B. $\frac{5\pi}{6}$
• C. $\frac{\pi}{3}$
• D. Both A and B

Answer 1

Answer: (D)

Both A and B

Answer 2

The correct option is (D) : Both A and B.