The infinitely permeabile iron core with W = 1.5 cm given above has a coil wrapped around it with N = 175 turns. The airgap g = 0.45 cm is fixed while the airgap x(t) cm is free to vary. The coil is driven by i(t) A of current. At time t = 0 seconds, the variable airgap is x(0) 0.14 cm, and the driving current is i(0) = 7 A. What is the numerical value of the flux linkage X at time t = 0 seconds? Neglect fringing. X[Wb turns] = = At time t = 0 seconds, the current i is increasing at a rate of 10 A/s, while the airgap x is closing at a rate of 3 m/s. What is the instantaneous voltage across the coil at time t = 0 seconds? Neglect fringing, and use the polarities marked in the diagram. v[V] = W IT! x(t) d v(t) + x(t) W Depth W into page W T