A wrought iron bar 30 cm long 2 cm in diameter is bent into a circular shape as shown in figure. It is the wound with 500 turns of wire. If the relative permeability of iron (μr) is 4000 and fringing effect is zero, the current required to produce a flux of 0.5 mwb in the magnetic circuit with an air gap of 1 mm is _____ (in A)
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