5. (2 pts) The resistivity of copper is about 1.7 x 10^-8 -m. 16-gauge wire has a diameter of 1.3 mm. You plan to use 16-gauge copper wire to connect your stereo to a speaker with resistance of 8. We will assume here that the current is flowing uniformly through the entire cross section of the wire, though this is not actually the case.

a. What is the longest this wire can be so that its resistance is less than 1% that of the speaker?

b. At some instant the speaker is drawing 2A of current. What is the voltage across the speaker at this time?

c. What is the current density in the wire at this time?