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Q16 Choose the correct answer If \theta is the angle between two vectors \vec a \: \: and \: \: \vec b  , then \vec a \cdot \vec b \geq 0 only when
     \\A ) 0 < \theta < \frac{\pi }{2} \\\\ \: \: \: \: B ) 0 \leq \theta \leq \frac{\pi }{2} \\\\ \: \: \: C ) 0 < \theta < \pi \\\\ \: \: \: D) 0 \leq \theta \leq\pi

Answers (1)

best_answer

Given in the question

\theta is the angle between two vectors \vec a \: \: and \: \: \vec b

\vec a \cdot \vec b \geq 0

|\vec a| | \vec b |cos\theta\geq 0

this will satisfy when 

cos\theta\geq 0

0\leq\theta\leq \frac{\pi}{2}

Hence option B is the correct answer.

Posted by

Pankaj Sanodiya

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