Abstract
A criterion of advisability of using one or another number of shells in a shield for obtaining the maximum shielding effectiveness is found by using the well-known approximate formula for the shielding factor of a magnetostatic spherical shield with an arbitrary number of shells. As this criterion, it is proposed to use twice the product of the shield material permeability by the square of the total thickness expressed in terms of the shield radius. It is shown that a deviation from the optimum number of the shells leads to considerable losses in the shielding effectiveness.
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