NEET Physics Resistance & Resistivity MCQ Question
If a copper wire has a length of 2 meters and a cross-sectional area of 1 mm², and its resistivity is 1.68 × 10⁻⁸ Ωm, what is its resistance?
0.0336 Ω
0.00336 Ω
0.336 Ω
36 Ω
Correct Answer
Detailed Explanation
Resistance R is calculated using the formula R = ρl/A, where ρ is the resistivity, l is the length, and A is the cross-sectional area. Substituting the given values: R = (1.68 × 10⁻⁸ Ωm * 2 m) / (1 × 10⁻⁶ m²) = 0.0336 Ω.
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