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 
and charge 
is projected horizontally with velocity 
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. oscillates inside cylinder along a horizontal diameter passing through axis of the cylinder time period
Text Solution
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Consider the 
view of the situation. Before any collision with the walls of cylinder, the particle will move in horizontal plane if 
But after 1st collision, 
and 
start acting in same direction along ve1tical and the particle is not able to move in horizontal plane.
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