We are able to obtain fairly large currents i | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The electric current $I$ in a conductor is given by the relation $I = nAev_d$, where $n$ is the number density of free electrons, $A$ is the cross

Vedclass · Accepted Answer

The number density of free electrons is very high and this can compensate for the low values of the electron drift speed and the very small magnitude of the electron charge

Vedclass · Answer

(B) The electric current $I$ in a conductor is given by the relation $I = nAev_d$, where $n$ is the number density of free electrons, $A$ is the cross-sectional area, $e$ is the magnitude of the electron charge, and $v_d$ is the drift speed.Although the drift speed $v_d$ is very small (typically $10^{-4} \, m/s$) and the charge $e$ is also very small $(1.6 	imes 10^{-19} \, C)$, the number density $n$ of free electrons in a conductor is extremely high (typically $10^{28} \, to \, 10^{29} \, m^{-3}$).This very high value of $n$ compensates for the small values of $v_d$ and $e$, allowing for the flow of a significant amount of current through the conductor.

We are able to obtain fairly large currents in a conductor because

Similar Questions

$A$ conductor of length $100 \, cm$ and area of cross-section $1 \, mm^2$ carries a current of $5 \, A$. If the resistivity of the material of the conductor is $3.0 \times 10^{-8} \, \Omega \cdot m$, then the electric field across the conductor is (in $ \, V/m$)

The dimensional formula of mobility is . . . . . .

$A$ current $I$ is passing through a wire having two sections $P$ and $Q$ of uniform diameters $d$ and $d/2$ respectively. If the mean drift velocity of electrons in sections $P$ and $Q$ is denoted by $v_P$ and $v_Q$ respectively,then

The magnitude of the drift velocity per unit electric field is known as . . . . . . .

$A$ potential difference $V$ is applied across the ends of a copper wire of diameter $d$ and length $L$. If only the diameter $d$ is doubled,the drift velocity becomes:

Vedclass Test Series

Exam Paper Generator

Online Exam Module