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A narrow beam of identical ions with spe...

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 strengths `E and B`, at the point O. 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 `I` from O. Find the equation of trace that the ion leaves on the screen. Demonostrate that at `z lt lt l`, it is the equation of a parabola.

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