What is the magnitude of the magnetic field at a point midway between them if the top one carries a current of 18.5 A and the bottom one carries 11.5 A

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.