PLEASE HURRY! IT'S TIMED! In the formula F = q v B:
Select one:
a. F must be perpendicular to B but not necessarily to v
b. F must be perpendicular to v but not necessarily to B
c. v must be perpendicular to B but not necessarily to F
d. F must be perpendicular to both v and B

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.