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ID#3802 Physics 1st MCQ (Dinajpur 2025)

যদি |A + B| = |A - B| হয়, তবে ভেক্টরদ্বয়ের মধ্যবর্তী কোণ কত?
ক) 0°
খ) 30°
গ) 90°
ঘ) 180°
গ

ব্যাখ্যা

$\sqrt{A^2+B^2+2ABcos\theta} = \sqrt{A^2+B^2-2ABcos\theta} \implies 4ABcos\theta = 0 \implies \theta = 90^\circ$।
Resource Details
Subject Physics 1st paper
Chapter 2
Board Dinajpur
Year 2025

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