Avery long conductor cyliner of length l and radius r carries a current density along the z-axis given by j(s')=i/s'

a) use ampere's law to find the b field inside and outside the wire in terms of s

if current is removed and replaced by uniform current on the outer surface of cylinder a all along z-axis and parallel to the x-y plane then,
c) use the biot-savart law to calculate the b field inside the cylinder.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.