Question

A conductor of specific conductance 2 mho $m^{-1}$ is subjected to an electric field of 5 N/C. if the cross sectional area of the conductor is 1 ${cm}^2$ the current through it will be

• A. 1mA
• B. 10 mA
• C. $40\mu A$
• D. $4\mu A$

Answer 1

The correct option is A 1mA

[A] J = current density

$\begin{array}{c}J=6\in \\ J=2\times 5=10\\ I=JA\Rightarrow 10\times {10}^{-4}={10}^{-3}=1mA\end{array}$