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A charge of -8 Coulombs (not micro-coulombs) with a mass of 4 kg is initially moving...

A charge of -8 Coulombs (not micro-coulombs) with a mass of 4 kg is initially moving in +y direction at 5 m/s, at the origin, in a uniform magnetic field of 9 Tesla directed in the -z direction. After exactly a half of period of motion, the magnetic field is changed, and after another half period of motion it is located at x = +4 meters, y = 0 meters. What is the amount of the magnetic after it changed in Tesla?

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