NEET Physics Ohm's Law MCQ Question
A copper wire has a cross-sectional area of 1.0 × 10^–7 m² and carries a current of 1.5 A. If each copper atom contributes one conduction electron, what is the drift velocity of the electrons? (Density of copper = 9.0 × 10^3 kg/m³, atomic mass = 63.5 u)
1 × 10^–4 m/s
8 × 10^–4 m/s
5.6 × 10^–5 m/s
3 × 10^–3 m/s
Correct Answer
Detailed Explanation
Using the formula for drift velocity v_d = I/(nAe), where n is the number of electrons per unit volume, calculated using copper's density and atomic mass, we find v_d = 1.1 × 10^–4 m/s.
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