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Electrical Applications 2 by David W. Tyler

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46 Materials and their applications in the electrical industry
I A (primary)
Figure 4.13
Figure 4.14
Figure 4.15
Figure 4.16
Where alternating current is involved the conductor carrying the
current, and hence producing the alternating magnetic flux, is sur-
rounded by the screen. The arrangement is in effect a transformer,
the conductor being the primary and the screen a short circuited
The alternating flux induces a voltage in the screen and a current
flows which sets up an opposing magnetic flux. The two fluxes are
very nearly equal so that the magnetic field outside the screen is