An electric field is formed due to a toroidal magnetic field when there is a change in the direction of the magnetic field over space. This can be seen when an electric current is passed through a coil, as the magnetic field will point in a circular direction around the wire. The electric field is then created in the form of concentric circles around the coil, perpendicular to the magnetic field.The introduction of a poloidal magnetic field helps to confine the plasma in a Nuclear Fusion Reactor (tokamak). This is because the poloidal magnetic field wraps around the toroidal magnetic field, creating a helical shape that can contain the plasma within the reactor. The two magnetic fields interact with the plasma, creating a pressure on it which keeps it confined within the tokamak.
