Abstract. Bianchi type-I magnetized cosmological model in scalar tensor theory proposed by Saez and Ballester (Phys. Lett. A 113 (1986) 467) with perfect fluid as a source is investigated. The source of the magnetic field is due to an electric current produced along the x-axis. F₂₃ is the non-vanishing component of electromagnetic field tensor. To get deterministic model, it has been assumed that the component σ₁¹, of eigenvalue of shear tensor σ_jⁱ is proportional to expansion scalar θ. The behavior of models in presence and absence of magnetic field with physical properties are discussed.

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