Let's imagine that we have frame (X,Y). There are two forces acting on the body: gravity which is directed down (in Y- direction) and Lorenz force that is directed up (in Y+ direction). If we change field direction the ball will fall on the ground even faster, so the only possible direction of the Lorenz force to keep ball above the ground is Y+ direction.
According to the second Newton's law,
(signs here are according to the directions of the forces)
since the ball is in equilibrium (a = 0).
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Answer:
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