A semiconductor based current sensor is used for detecting small variations in electrical currents in a microchip. A total current density in a semiconductor material is to be measured. What is the total current density in a semiconductor material?

Correct option is C

​$$\text{In a semiconductor, the \textbf{total current density} is the sum of:} \\[6pt]\bullet \ \textbf{Drift current} \rightarrow \text{ due to electric field} \\[2pt]\bullet \ \textbf{Diffusion current} \rightarrow \text{ due to concentration gradient} \\[6pt]\text{Thus,} \\[6pt]J_{\text{total}} = J_{\text{drift}} + J_{\text{diffusion}}$$​​