Two identical coils are wound on a ring-shaped iron core that has a relative permeability of 500. Each coil has 100 turns, and the core dimensions are: cross- sectional area A=3 cm2 and magnetic path length l=20cm. Assume k=0.5. Calculate: a. Mutual inductance b. Total inductance

Can someone provide a step by step please? TIA...

Consider the large inductor in Figure 3 with given number of turns N, core permeability μ, core cross section area A, and core diameter are given. Note that the core length l is equal to π times the core diameter. Answer the questions and pick an answer from the given choices. As a consequence, the practical inductor above can be represented by it inductance L in series with the resistance of the coil R (calculated above). Let this equivalent R-L circuit be connected to a 12 V source that has an internal resistance of 0.5 Ω as shown on the right hand side of Figure 3. Let switch SW2 be in the open position, while SW1 closed at t = 0.    Nearly how long will it take the inductor to fully charge (i.e., reach steady-state)? 1) 1.5 sec 2) 100 msec 3) 18.5 min 4) 37 sec

In a certain magnetic circuit, the core is represented two reluctances as shown below. Assume a relative permeability μr = 2500, and a number of turns N = 420 turns. Find the current needed to produce a flux of 15 mWb in the core. སྐ Select one: O a. i=142 mA O b.i=14.2 A c.i=1.42 A O d. None Clear my choice RI =15624 A.t/Wb Rgap = 24.2 KA.t/Wb