Question

In case of conductors and insulators, if an electric field is applied then conduction current density$\overrightarrow{\left(J\right)}$ is:

• A. in the direction of electron flow.
• B. in the direction of proton flow.
• C. in the direction of electric field.
• D. against the direction of electric field.

Answer 1

Answer: (B), (C)

The correct options are
B in the direction of proton flow.
C in the direction of electric field.

Current density, $\overrightarrow{J}=\frac{I}{\overrightarrow{A}}$

Current flows in direction of flow of protons. And the direction of electric field is in the direction of flow of electrons.

And the direction of current density is in the direction of proton flow, so from above statements, current density is also in the direction of electric field.