[单选题]
Consider two copper wires each carryingk bn6j5m 7puf4 a current of 3.0 A. On5vj-e q8dtxo1 ,4* vdjl y.rfme wire has twice the diameter of the other. The ratio of the drift velocity in th 5 fejov4l djtdv.,yxr8m-1q* e smaller diameter wire to that in the larger diameter wire is
