ভেক্টর রাশি-৪

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\(\vec{P}.\vec{Q}=-PQ\) হলে -
(i) \(\vec{P}\) ও \(\vec{Q}\) পরস্পর সমান্তরাল
(ii) \(\vec{P}\) ও \(\vec{Q}\) পরস্পর বিপরীতমুখি
(iii) \(\vec{P}\) ও \(\vec{Q}\) এর মধ্যবর্তী কোণ \(0^{o}\)
নিচের কোনটি সঠিক ?
[ ঢাঃ ২০১৭ ]

(ii) ও (iii)
(i) ও (iii)
(i) ও (ii)
(i), (ii) ও (iii)
উপরের কোনোটিই নয়

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Ans: (ii) ও (iii)
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