For a Year 12 Assignment I have to do a seminar on how magnetic fields are involved with a certain topic. I chose nuclear fusion energy production and specifically the tokamak. I understand that a toroidal magnetic field is created when a current is sent through a solenoid wrapped in a torus. And that in nuclear fusion, this field forces the plasma to move in circular motion around the tokamak. But, in a tokamak, from my understanding, another solenoid is placed vertically in the center of the tokamak. Apparently sending a current through this solenoid induces a current in the plasma. How does it do this? Is it because the magnetic field generated from the center solenoid interacts with the toroidal magnetic field and changes its strength, therefore creating a current in the wire? How is current induced in the plasma in a tokamak?