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

Current density is directly proportional to the potential difference, so increasing the potential difference between the two ends of the wire will increase the current density.

Option D is incorrect, as heating the wire will increase its resistance, which will decrease the current density. Options A, C, and E are also incorrect as they will decrease the current density.

To Increase the Current Density in a Wire of Length