A core forms a closed magnetic loop of path length 32  cm. Half of this path has a cross-sectional area of 2  cm^2 and relative permeability 800 . The other half has a cross-sectional area of 4  cm^2 and relative permeability 400 . Find the current needed to produce a flux of 0.4  Wb in the core if it is wound with 1000 turns of insulated wire. Ignore leakage and fringing effects.
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