Discussion
Flux enters iron of relative permeability 1000 from air at 45 degrees to the surface. Within the iron the angle to the normal is about
Answer: C
The relation \( \tan\theta_2 = \mu_r\tan\theta_1 \) gives a tangent of a thousand, whose angle is 89.94 degrees. Flux entering iron at any appreciable angle therefore runs almost parallel to the surface within it, which is the basis of magnetic shielding.
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