Figure 11.9
11.29 Simulated Surface Current Density. It is possible to simulate a current sheet at an interface by placing thin parallel
wires at the interface. Suppose two materials meet at an interface on the x–y plane at z ¼ 0. Both materials are the
same, with relative permeability μr ¼ 2. The magnetic field intensity in material (1) (z > 0) is given as H1 ¼ ^x105
þ^y2 105 þ ^z104 [A/m]. Suppose now that wires are placed on the interface such that the current in the wire points
at 45 to the x axis, as shown in Figure 11.10. The current in each wire is 0.1 A and there are two wires per mm length.
Calculate:
(a) The magnetic field intensity in material (1) and in material (2) before the current in the wires is added.
(b) The magnetic field intensity in both materials after the current is switched on.