In a cylindrical region uniform magnetic field is present as shown in the figure. The cylinder is kept on a horizontal plane and its axis is horizontal. If a charge particle of mass m and charge q is projected horizontally with velocity v through a hole normal to the axis of the cylinder as shown
in the diagram. An observer states the particle moves first undeviated and subsequently

Question

Infinity Learn · Accepted Answer

Consider the $$2D$$ view of the situation. Before any collision with the walls of cylinder, the particle will move in horizontal plane if qvB $$=$$ mg.But after $$1st$$ collision, qvB and mg start acting in same direction along vertical and the particle is not able to move in horizontal plane.

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