is placed
symmetrically along z-axis and has radius a («).
The cable consists of a thin wire and a co-axial conducting tube. An
alternating current
(t) = 
sin 
flows down the central
thin wire and returns along the co-axial conducting tube. The induced electric
field at a distance s from the wire inside the cable is
(i)
Calculate the displacement current density inside the cable.
(ii)
Integrate the displacement current density across the cross-section of the
cable to find the total displacement current 
.
(iii) Compare
the conduction current 
with the
displacement current 
Answer:
(i) Given, the induced
electric field at a distance r from the wire inside the cable is
Displacement
current density.
(ii) 
(iii) The displacement current,
Where 
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