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ID#5665 HSC Physics 1st MCQ (Rajshahi 2025)

r = 3xi - 2yj + 4zk হলে ∇ · r = ?
ক) 3
খ) 5
গ) 9
ঘ) 12

ব্যাখ্যা

$
abla \cdot \vec{r} = \frac{\partial}{\partial x}(3x) + \frac{\partial}{\partial y}(-2y) + \frac{\partial}{\partial z}(4z)$
$= 3 - 2 + 4 = 5$
Resource Details
Exam HSC
Subject Physics 1st paper
Chapter 2
Board Rajshahi
Year 2025

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