Question

Let $\overrightarrow a$ and $\overrightarrow b$ be two unit vectors and θ is the angle between them. Then $\overrightarrow a +\overrightarrow b$ is a unit vector if

• A. $θ=\frac{π}{4}$
• B. $θ=\frac{π}{3}$
• C. $θ=\frac{2π}{3}$
• D. $θ=\frac{π}{2}$

Answer 1

Answer: (C)

$θ=\frac{2π}{3}$

Answer 2

The correct answer is Option (C) : $θ=\frac{2π}{3}$