Wires A and B, having equal lengths of 40.0 m and equal diameters of 2.60 mm, are connected in series. A potential difference of 60.0 V is applied between the ends of the composite wire. The resistances are RA = 0.127Ω and RB = 0.729Ω. For wire A, what are?

(a) Magnitude J of the current density and

(b) Potential difference V?

(c) Of what type material is wire A made (see Table 26-1)? For wire B, what are?

(d) J and

(e) V?

(f) Of what type material is B made?