Question
State expression for current density in terms of conductivity.
✓
Answer
Current density, $\vec{J}=\frac{1}{\rho} \vec{E}=\sigma \vec{E}$
where, $\rho=$ resistivity of the material
$E =$ electric field intensity
$\sigma=$ conductivity of the material
where, $\rho=$ resistivity of the material
$E =$ electric field intensity
$\sigma=$ conductivity of the material
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Express vector $\overrightarrow{ A C }$ in terms of vectors $\overrightarrow{ A B }$ and $\overrightarrow{ C B }$ shown in the following figure.
→What is the difference between uniform and non-uniform motion?
A force $\overrightarrow{ F }= 3 \hat{ i }+\hat{ j }- 4 \hat{ k }$ is applied at a point (3, 4, -2). Find its torque about the point $(-1,2,4)$.
→State advantages of friction.
Define the term : Arithmetic mean
Two bodies undergo one-dimensional, inelastic, head-on collision. State an expression for their final velocities in terms of their masses, initial velocities and coefficient of restitution.
What is a real e.m.f. device?
A Ge specimen is doped with $A$. The concentration of acceptor atoms is $~10^{21} atoms/m^3.$ Given that the intrinsic concentration of electron$-$hole pairs is $~10 ^{19}/m^3,$ calculate the concentration of electrons in the specimen.
→Friction is a necessary evil.
It is easy to roll than pull a barrel along a road.