A conductor of non-uniform cross-section is c | vedclass

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

Question

(B) $1$. The current $I$ flowing through the conductor is constant throughout because it is a series circuit.$2$. Current density $J = I/A$. Since the

Vedclass · Accepted Answer

The current density is lower at $P$ than at $Q$.

Vedclass · Answer

(B) $1$. The current $I$ flowing through the conductor is constant throughout because it is a series circuit.$2$. Current density $J = I/A$. Since the cross-sectional area $A_P > A_Q$, the current density $J_P $3$. Electric field $E = J/\sigma = I/(A\sigma)$. Since $A_P > A_Q$, $E_P $4$. The rate of heat production per unit length is $dH/dx = I^2 R/dx = I^2 \rho / A$. Since $A_P > A_Q$, the rate of heat production is lower at $P$ than at $Q$.$5$. Therefore, the correct statement is that the current density is lower at $P$ than at $Q$ (Option $B$).

$A$ conductor of non-uniform cross-section is connected to a source of constant potential difference as shown in the figure. Then:

Similar Questions

The drift velocity of the electrons in a copper wire of length $2\ m$ under the application of a potential difference of $200\ V$ is $0.5\ m/s$. Their mobility (in $m^2 V^{-1} s^{-1}$) is

Derive the equation of mobility in terms of electric current.

Charge passing through a conductor of cross-section area $A=0.3 \,m^2$ is given by $q=3 t^2+5 t+2$ in coulomb,where $t$ is in second. What is the value of drift velocity at $t=2 \,s$ ? (Given,$n=2 \times 10^{25} / m^3$ )

$A$ copper wire has a square cross-section,$2.0 \, mm$ on a side. It carries a current of $8 \, A$ and the density of free electrons is $8 \times 10^{28} \, m^{-3}$. The drift speed of electrons is equal to

Vedclass Test Series

Exam Paper Generator

Online Exam Module