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ID#5683 HSC Physics 1st MCQ (Rajshahi 2025)

তারের ব্যাস 2mm, দৈর্ঘ্য 0.5% বৃদ্ধি করতে কত বল লাগবে? (Y=2.1x10¹¹)
ক) 2.15 x 10³ N
খ) 2.61 x 10³ N
গ) 2.98 x 10³ N
ঘ) 3.29 x 10³ N

ব্যাখ্যা

$F = Y A \frac{l}{L} = 2.1 \times 10^{11} \times \pi (10^{-3})^2 \times 0.005$
$F = 2.1 \times 10^{11} \times 3.1416 \times 10^{-6} \times 0.005 \approx 3298.6 N$
Resource Details
Exam HSC
Subject Physics 1st paper
Chapter 7
Board Rajshahi
Year 2025

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