Question

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because

• A. electron number density depends on temperature
• B. electron number density is very large
• C. relaxation time is small
• D. drift velocity of electron is very large

Answer 1

Answer: (B)

electron number density is very large

Answer 2

Current I =$ne AV_{d}$ The large value of I is because of number density of free electrons in a conductor (n) which is of the order n = $10^{28} \, per \,m^{3}$