Q 2801301228.     A narrow beam of identical ions with specific charge `q/m`, possessing different velocities, enters the region of space, where there are uniform parallel electric and magnetic fields with strength `E` and induction `B`, at the point `O` (see Fig. ). The beam direction coincides with the `x` axis at the point `O`. A plane screen oriented at right angles to the `x` axis is located at a distance `l` from the point `O`. Find the equation of the trace that the ions leave on the screen. Demonstrate that at `z < < l` it is the equation of a parabola.

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