given velocity and acceleration, determine magnetic field

[yanyin]

an electron has a velocity of 1.20 x 10^4 m/s(in the positive x direction), and an acceleration of 2.00 x 10^12 m/s^2 (in the positive z direction) in a uniform electric and magnetic field. if the electric field has magnitude of 20.0N/C (in the positive z direction), what can you determine about the magnetic field in the region? what can you not determine?
(Please show steps and why, the correct answers i got are Bx(any value), By = -2.6mT, Bz=0)

[GRQC]

Originally posted by yanyin
an electron has a velocity of 1.20 x 10^4 m/s(in the positive x direction), and an acceleration of 2.00 x 10^12 m/s^2 (in the positive z direction) in a uniform electric and magnetic field. if the electric field has magnitude of 20.0N/C (in the positive z direction), what can you determine about the magnetic field in the region? what can you not determine?
(Please show steps and why, the correct answers i got are Bx(any value), By = -2.6mT, Bz=0)

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