A current of is flowing in a typical extension cord of length . The cord is made of copper wire with diameter 4.12mm
The charge of the electron is 1.6E-19. The mass of the electron is 9.1E-31. The resisitivity of copper is 1.7E-8 The concentration of free electrons in copper is 8.5E28
Find the total number of collisions that all free electrons in this extension cord undergo in one second.