Question

(A) The drift velocity of electrons decreases with the increase in the temperature of conductor.

(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.

(C) The drift velocity does not depend on the applied potential difference to the conductor.

(D) The drift velocity of electron is inversely
proportional to the length of the conductor.

(E) The drift velocity increases with the increase in the temperature of conductor.

Choose the correct answer from the options given below

• A. $\left(B\right)\text{and}\left(E\right)$ only
• B. $\left(A\right)\text{and}\left(D\right)$ only
• C. $\left(A\right)\text{and}\left(B\right)$ only
• D. $\left(B\right)\text{and}\left(C\right)$ only

Answer 1

The correct option is C $\left(A\right)\text{and}\left(B\right)$ only

We can use the following formula in order to calculate drift velocity:

$I=nAvQ$

Where,

• $I$ is the current flowing through the conductor which is measured in amperes.
• $n$ is the number of electrons.
• $A$ is the area of the cross-section of the conductor which is measured in ${\text{m}}^2$.
• $v$ is the drift velocity of the electrons.
• $Q$ is the charge of an electron which is measured in Coulombs.

$V_d$ decreases with increase in temperature and $V_d$ is inversely proportional to the area of cross section.
Hence, the correct option is $a$.