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Protons move rectilinearly in the region of space where there are uniform mutually perpendicular electric and magnetic fields `E` and `B`. The trajectory of protons lies in the plane xz as shown in the figure and forms an angle 9 with x-axis. Find the pitch of the helical trajectory along which the protons will move after the electric field is switched off.

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The correct Answer is:
`[(2pi mE)/(q B^(2)) tan phi]`
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PHYSICS GALAXY - ASHISH ARORA-MAGNETIC EFFECTS OF CURRENT AND MAGNETISM-Practice Exercise
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