A magnetic core with an air gap is shown below. For a relative permeability is 3500, and the space free permeability is 4pix10^-7 H/m. Find the reluctance of the left leg and the top side of the core. Ignore the gap in your calculations.
Find attached picture

Select one:
a. Rleft = 1251 A. t./Wb , Rtop = 1023 A. t/
Wb
b. None
c. Rleft = 12.51 KA. t./Wb , Rrop = 10.23 KA. t/Wb
d. Rleft = 125.1 A. t./Wb , Rtop = 102.3 A. t/Wb​

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?