ভেক্টর রাশি-৪

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\(Y\) অক্ষের সাথে \(\vec{r}=4\hat{i}-4\hat{k}\) ভেক্টরের উৎপন্ন কোণ হবে-
[ সিঃ ২০১৭ ]

\(0^{o}\)
\(45^{o}\)
\(90^{o}\)
\(180^{o}\)
উপরের কোনোটিই নয়

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Ans: \(90^{o}\)
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