Question

for a fixed potential difference applied across a conductor, the drift speed of free electrons does not depend upon
a) free electron density in the conductor
b)mass of the electrons.
c) length of the conductor
d) temperature of the conductor​

Answer 1

Answer:

C option

Explanation:

Go by formula v=eE/m

Density is more more collision less speed but length doesn't affect

Answer 2

The drift velocity of electrons is given by the formula:

$v_{d} =\frac{eV\tau }{ml}$

where,

e= electronic charge

V= potential difference across the conductor

τ= relaxation time

m= mass of the electrons

l= length of the conductor

• If we increase the temperature the kinetic energy changes, hence the drift velocity.
• Also, the drift velocity depends on the mass of the conductor and the length of the conductor.
• Hence, the drift speed of free electrons does not depend upon free electron density in the conductor.

The correct option is a) free electron density in the conductor.