An iron cored toroid of relative permeability 980 has a mean length of 120 cm and core are of 100mm^2. A current of 0.3 A establish a flux of 40microWb, calculate the number of turns of coil, Self-inductance and the energy stored in magnetic field

2. A solenoid is 1 Cm long with a diameter of 0.5 Cm. The core is SiFe with a relative permeability of 4200. Assuming a current of 100 mA, what is the maximum number of turns for the winding that keeps the core under the saturation magnetic field of about 1.5 Tesla?

A ten-turn solenoid has a ferromagnetic core with a relative permeability of 10,000. The length of the solenoid is l=10 cm and its cross section area is A=1 cm2.  The amount of current driving the solenoid is 0.1 A.  Determine the magnetic flux intensity H in the core. Provide your answer in A/m.  Round off to your answer to one decimal.