A rod with circular cross-section area 2cm 2 and length 40cm is wound uniformly with 400 turns of an insulated wire. If a current of 0.4 A flows in the wire windings, the total magnetic flux produced inside windings is 4π × 10 –6 Wb. The relative permeability of the rod is (Given: Permeability of vacuum μ 0 = 4π × 10 –7 NA –2 )

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A rod with circular cross-section area 2cm 2 and length 40cm is wound uniformly with 400 turns of an insulated wire. If …

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