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Question
0.48M দীর্ঘ ও 0.12MM ব্যাসের একটি তারের রোধ 15Ω হলে তারটির উপাদানের আপেক্ষিক রোধ কত?
4
.
63
×
10
-
2
Ω
m
5
.
53
×
10
-
3
Ω
m
3
.
53
×
10
-
7
Ω
m
2
.
21
×
10
-
7
Ω
m
ANSWER : 3
Descrption
<p style="margin-left:0px;"><strong>3.53×10-7Ωm</strong>।</p><p style="margin-left:0px;">একটি তারের রোধ হল:</p><p>R = ρ * L / A</p><p style="margin-left:0px;">যেখানে,</p><ul><li>R হল রোধ (Ω)</li><li>ρ হল আপেক্ষিক রোধ (Ωm)</li><li>L হল দৈর্ঘ্য (m)</li><li>A হল প্রস্থচ্ছেদের ক্ষেত্রফল (m²)</li></ul><p style="margin-left:0px;">এই ক্ষেত্রে,</p><ul><li>R = 15 Ω</li><li>L = 0.48 m</li><li>A = π * (0.12 mm)² / 4 = 3.14 × 10⁻⁷ m²</li></ul><p style="margin-left:0px;">সুতরাং, আপেক্ষিক রোধ হবে:</p><p>ρ = R * A / L</p><p>ρ = 15 Ω * 3.14 × 10⁻⁷ m² / 0.48 m</p><p>ρ = 3.53 × 10⁻⁷ Ωm</p><p style="margin-left:0px;">অতএব, উত্তর হল <strong>3.53×10-7Ωm</strong>।</p>
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