Two toroidal solenoids are wound around the same form so that the magnetic field of one passes through the turns of the other.Solenoid 1 has 690 turns and solenoid2 has 400 turns. When the current in solenoid 1 is 6.45 A, the average flux through each turn of solenoid 2 is 0.0320 Wb.
a) What is the mutual inductance of the pair of solenoids?
b) When the current in solenoid 2 is 2.54 A, what is the average flux through each turn of solenoid 1?