Question

A current $I$ flows through a cylindrical rod of uniform cross-section area $A$ and resistivity $\rho$. The electric flux through the shaded cross-section of rod as shown in figure is:

• A. $22\rho I$
• B. $2\rho I$
• C. $\frac{\rho I}{A}$
• D. $\frac{\rho A}{I}$

Answer 1

The correct option is C $\frac{\rho I}{A}$

Current $=I$

area $=A$

resistivity $=\rho$

The electric flux through the shaded cross section of rod $R=\rho \frac{I}{A}$ using oken's law.