Question

Which of the following characteristics of electrons determines the current in a conductor?

• A. Drift velocity alone
• B. Thermal velocity alone
• C. Both drift velocity and thermal velocity
• D. Neither drift nor thermal velocity

Answer 1

The correct option is A Drift velocity alone

A. Drift velocity only.

The current in a conductor,

$I=neA{V}_d$

where, $n=$ no. of free charge density

$A=$ cross-sectional area of conductor

$V_d=$ Drift velocity

From the above, Drift velocity is only responsible for the current in a conductor.