Find the possible directions of a uniform magnetic field that exerts the forces

Question

Find the possible directions of a uniform magnetic field that exerts the forces F1 and F2 respectively on charges q1 and q2 in the figure below. (The z-axis is perpendicular to both x and y axes. Select all that apply.)

The magnetic field is in the +x direction.
The magnetic field is in the -x direction.
The magnetic field is in the +y direction.
The magnetic field is in the -y direction.
The magnetic field is in the +z direction.
The magnetic field is in the -z direction.

http://www.webassign.net/colfunphys1/21-p-004.gif

Explanation / Answer

since q1 and q2 charges are unknown thus exact direction cannot be decide but since q2 has its velocity component in both x,y direction thus magnetic field is in either +z or -z.

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