Resistivity
Mediumphysics
A wire of length 2 m, cross-sectional area 1 mm², and resistivity 1.7 × 10⁻⁸ Ω·m has what resistance?
Select the correct option:
Solution
Incorrect! Answer:
0.034 Ω
- Resistance Formula: R=ρAL, where ρ is resistivity, L is length, and A is area.
- Unit Conversion: Area A=1 mm2=1×(10−3 m)2=10−6 m2.
- Identification: L=2 m and ρ=1.7×10−8 Ω⋅m.
- Calculation:
- R=10−61.7×10−8×2
- R=3.4×10−8×106=3.4×10−2.
- Result: R=0.034 Ω.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More resistivity Practice Questions
About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- resistivity
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
0.034 Ω
- Resistance Formula: R=ρAL, where ρ is resistivity, L is length, and A is area.
- Unit Conversion: Area A=1 mm2=1×(10−3 m)2=10−6 m2.
- Identification: L=2 m and ρ=1.7×10−8 Ω⋅m.
- Calculation:
- R=10−61.7×10−8×2
- R=3.4×10−8×106=3.4×10−2.
- Result: R=0.034 Ω.
This medium difficulty physics question is from the chapter current electricity, covering the topic of resistivity. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse current electricity questions on RankGuru.