Answer: Points toward +y direction
Explanation:
If a positively charged particle is moving in a magnetic field, an electromagnetic force occurs. The direction of this force is determined by applying right hand rule which explains like that; open four fingers of your right hand and point the thumb in the direction of the velocity and the fingers in the direction of Magnetic field ( B ). A perpendicular vector to the palm points in the direction of the force ( F ). In given drawing the perpendicular to the palm of right hand is + y direction.
