Hello,
I have a question; that when you decrease the cross sectional area of a wire, does the 'drift velocity' of electrons in a wire increase or decrease? From the quation I=nAqv, if we keep the current & n constant, we see that the velocity decreases as you increase the cross sectional area & vice versa Why? I thought that as you decrease the cross sectional area, the collisions between the free electrons & the ions in the conducting wire increase, therefore impeding the 'smooth' movement of electrons i.e decreasing their velocity & hence leading to an overall fall in the average drift velocity. This is not the case, however. What am I missing?
Help appreciated.