A charge of +7 Coulombs (not micro-coulombs) with a mass of 0.29 kg is initially moving in +y direction at 266 m/s, at the origin, in a uniform magnetic field of 4.41 Tesla directed in the -z direction. After exactly a half of period of motion, the magnetic field is changed in magnitude (not direction), and after another half period of motion it is located at x = -1.54 meters, y = 0 meters. What is the amount of the magnetic field after it changed in Tesla?