Physics-Ohm's Law
NEET Physics Ohm's Law MCQ Question
Type: MCQ-numerical-Hard-Class 12
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)
A
1 × 10^–4 m/s
B
8 × 10^–4 m/s
C
5.6 × 10^–5 m/s
D
3 × 10^–3 m/s
Correct Answer
Option A
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.
Found an issue with this question?