Question

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1.) A positively charged particle moves with constant velocity through a region of uniform electric and magnetic fields. The electric field in the region is in the negative z-direction and the magnetic field in the region is in the positive y-direction. Ignore the weight of the particle. What is the direction of the velocity of the particle in this region?
A) Positive x
B) Positive y
C) Positive z
D) Negative x
E) Negative y
2.) A negative point charge moves with a velocity in the positive x-direction. As the point charge moves through the origin, in what direction is its magnetic field at a point on the positive z-axis?
A) +X
B) -X
C) +Y
D) -Y
E) -Z

Please explain in details thank you

Answer 1