阿摩線上測驗
題組內容
3.(20%) A long, straight, non-magnetic conductor of 
m radius carries current of 1 A dc. Assuming the current is+z directed.ρ(in meter) i ce measured from the z-axis, and the axis of the conductor is coincident wit (The permeability (μ0) =
(H/m)
(a) Find the current density (
) within the conductor. (3%)