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

According to Ohm's law, current density is directly proportional to the potential difference (V) and inversely proportional to the cross-sectional area of the wire (A). Therefore, increasing the potential difference will increase the current density. Heat may increase the resistance of the wire, so option E is not the best choice. Options A and C are incorrect because they describe ways to decrease the current density.

To Increase the Current Density in a Wire of Length