The cast steel parallel circuit shown above has a 400turn co

The cast steel parallel circuit shown above has a 400-turn coil and a uniform cross-section of s = 2 cm^2. The mean lengths l_1 = l_3 =11 cm and l_2 = 5 cm. Determine the coil current, I, necessary in a flux density B_3 = 3 T. To maintain the same amount of flux in leg 3(B_3), how much current is needed if the numbers of coil turns is reduced to N = 200?

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