(Solved): The core of the magnetic circuit of Fig. (a) is made of steel whose \( B \) - \( H \) characterist ...

The core of the magnetic circuit of Fig. (a) is made of steel whose \( B \) - \( H \) characteristic is shown in Fig. (b) The core flux is \( 1.55 \mathrm{mWb} \). If the core mean length is \( 300 \mathrm{~mm} \) and the core has a circular cross section of radius 19.5 mm, determine the coil current. The coil has 100 turns.