Question

If $\bar a\ and\ \bar b$ are position vectors of the points (a, 3, 0) and (1, 0, 0) respectively and if the angle between the vectors $\bar a\ and\ \bar b\ is\ \frac{\pi}{4}$, then the value of a is equal to

• A. 1
• B. 2
• C. 3
• D. 4
• E. 5

Answer 1

Answer: (C)

3

Answer 2

The correct option is (C) : 3