To increase the current density in a wire of length and diameter D, you can
A) decrease the potential difference between the two ends of the wire.
B) increase the potential difference between the two ends of the wire.
C) decrease the magnitude of the electric field in the wire.
D) heat the wire to a higher temperature.
E) combine both (b) and (d).

Question

To increase the current density in a wire of length  and diameter D, you can
A) decrease the potential difference between the two ends of the wire. 
B) increase the potential difference between the two ends of the wire. 
C) decrease the magnitude of the electric field in the wire. 
D) heat the wire to a higher temperature. 
E) combine both (b) and (d).

Quizplus · Accepted Answer

The current density in a wire is directly proportional to the potential difference between its two ends. Hence, increasing the potential difference will increase the current density.

To Increase the Current Density in a Wire of Length