Question

uniform plasma is created in a toroidal chamber with square cross section of length a.
The magnetic field is provided by a current I along the axis of symmetry. The dimensions
are a =1 cm, R=10 cm. The plasma is Maxwellian with kT =100 eV and has density
n=1019 m−3. The magnetic field at the centre of the torus is 1 T, there is no electric field.
Calculate the current (caused by particle drift) between the top and the bottom plates of
the chamber.