3-1.Vectors
medium

 $\overrightarrow {\;A} $ और $\overrightarrow {\;B} $ दो सदिश हैं जिनके बीच का कोण $\theta$ है। यदि $|\overrightarrow { A } \times \overrightarrow { B }|=\sqrt{3}(\overrightarrow { A } \cdot \overrightarrow { B }),$ तो $\theta$ का मान होगा

A

$60$

B

$45$

C

$180$

D

$0$

(AIPMT-2007)

Solution

$\left| {\vec A \times \vec B} \right| = \sqrt 3 \left( {\vec A \cdot \vec B} \right)$

$AB\sin \theta  = \sqrt 3 AB\cos \theta$

$\tan \theta  = \sqrt 3$

$\theta  = {\tan ^{ – 1}}\sqrt 3  = {60^ \circ }$

Standard 11
Physics

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