Q174 / 180 · KCET 2019 · Physics

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
Correct answer
B
electron number density is very large
C
relaxation time is small
D
drift velocity of electron is very large

Solution

(B)
Current I = neAV \( _{d} \)
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 \( m^{3} \)

Hence, the correct answer is option: 'B'.

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

Solution

Relevant Questions

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