Question

The current of 0.5 Amp is flowing in a copper wire whose cross-sectional area is 1mm². If the number of free electrons is 8.5 × 10²² per cm³ in unit volume then find out the drift velocity of electrons?

Answer 1

Area of cross section = 1 mm²
= 1 ×(10³)² = 1 × 10^-6 m²
Number of free electrons (n) = 8.5 × 10²² / cm³
= 8.5 × 10²⁸/m³
Current (I) = 0.5 amp