1) is B (2p r) So we have
B (2pr) = m0i (t)
   (8 2)
JAMES CLERK MAXWELL (1831–1879)
James Clerk Maxwell
(1831 – 1879) Born in
Edinburgh, Scotland,
was among the greatest
physicists 
of 
the
nineteenth century He
derived the thermal
velocity distribution of
molecules in a gas and
was among the first to
obtain 
reliable
estimates of molecular
parameters 
from
measurable quantities
like 
viscosity, 
etc