ভেক্টর রাশি-৩

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পাশের চিত্রের আলোকে \(\vec{A}\) ও \(\vec{B}\) ভেক্টরদ্বয় পরস্পর \(O\) বিন্দুতে \(\theta\) কোণে ক্রিয়াশীল। এদের স্কেলার গুণন \(\vec{A}.\vec{B}\) এবং ভেক্টর গুণন \(\vec{A}\times{\vec{B}}\) দ্বারা প্রকাশ করা হয়। \(\vec{A}=-\vec{B}\) হলে \(\vec{A}\times{\vec{B}}\) এর মাণ শূন্য হবে, যখন ভেক্টরদ্বয়ের মধ্যবর্তী কোণ - mqphyvecimage
\(\theta=\frac{\pi}{4}\)
\(\theta=\pi\)
\(\theta>\pi\)
\(\theta<\frac{\pi}{2}\)
উপরের কোনোটিই নয়

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Ans: \(\theta=\pi\)
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