If a current of 18.2 Ampere per second flows through a copper conductor and the average collision time of electrons is 0.25 μs, then the value of conductivity of the copper conductor is ______.
1
0.80 × 106 mho/m
2
4.55 × 106 mho/m
3
72.8 × 106 mho/m
4
13.7 × 106 mho/m