The dependence of the degree of anomaly of parameter Z of Geneva photometry (Z0=Z_CP_-Z_norm_) on the average surface magnetic field Bs is analyzed. The Z0 value is proportional to the degree of anomaly of chemical composition. It was found that Bs-->0 corresponds Z0-->-0.010/-0.015, i.e., part of CP stars are virtually devoid of magnetic field, but exhibit chemical anomalies. This effect may be due to selection whereby only objects with strong chemical anomalies are classified as CP stars, thereby producing a deficit of stars with relatively weak anomalies. Moreover, CP stars have other sources of stabilization of their atmospheres besides the magnetic field, e.g., slow rotation. Formulas relating Z0 to Bs are derived.

Cone search capability for table J/other/AstBu/62.244/table2 (Parameters Z0, which characterizes the intensity of the {lambda}5200{AA} depression, and {Delta}X, which characterizes the degree of chemical anomalies)

Cone search capability for table J/other/AstBu/62.244/table3 (Data for deriving the Z0-Bs relation for Bs values determined from line splitting (in kG))

Cone search capability for table J/other/AstBu/62.244/table4 (Data for deriving the Bs-Z0 relation with Bs determined from the relation Bs=(5.6+-0.6)(-(0.16+-0.12)))