Question

Find $\overrightarrow{A}.\overrightarrow{B}$

• A. 50
• B. 25
• C. 0
• D.

Answer 1

The correct option is C

0

$|\overrightarrow{A}|=5$

$|\overrightarrow{B}|=10$

$\overrightarrow{A}.\overrightarrow{B}=|\overrightarrow{A}||\overrightarrow{B}|cos\theta$

Where $\theta$ is the angle between $\overrightarrow{A}$ & $\overrightarrow{B}={120}^{\circ }-{30}^{\circ }$

$\overrightarrow{A}.\overrightarrow{B}=5\times 10\times cos{90}^{\circ }$

$=0$ $(\because cos{90}^{\circ }=0)$