Question
Sun September 23, 2012 By: Thomas Albin
 

How does the drift velocity of electrons in a metallic conductor change if the length of the conductor is doubled and the applied voltage is kept constant ?

Expert Reply
Mon September 24, 2012
drift velocity:vd=eEtao/m   where, tao(?)=relaxation time,e=charge of one electron, E=electric field
E=V/l   V=potential difference, l=length of conductor
so,
vd=eEtao/m =eV?/ml
so
if the length of the conductor is doubled and the applied voltage is kept constant,
then the drift velocity of electrons in a metallic conductor will be half as drift vel of electrons are inversely proportional to the length of the conductor.
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