Q4: An 1154 turn's coil is wound on the central limb of the cast iron frame shown in Fig. a total flux of 0.96 mWb is required in the air gap. Find the current required through the gap. Frame dimensions are given in cm. Assume that the gap density is uniform and there is no leakage and B/H characteristic of cast-iron as bellow: N-1154 24 B (T) 0.1 0.2 H(AT/m) 280 620 0.35 0.4 0.5 0.6 990 1400 2000 2800 (12 Marks)