DA positron (positively charged electron) with a kinetic energy of 3.6 x 10-18 J is projected into a uniform magnetic field B = 420 µT with its velocity vector making an angle of 60° with B. Because the particle has components of velocity both parallel and perpendicular to the magnetic field, it moves in a spiral. Find the period, pitch p and radius r of the helical path. (Pitch is the distance it moves forward during a period.)

DA positron (positively charged electron) with a kinetic energy of 3.6 x 10-18 J is projected into a uniform magnetic field B = 420 µT with its velocity vector making an angle of 60° with B. Because the particle has components of velocity both parallel and perpendicular to the magnetic field, it moves in a spiral. Find the period, pitch p and radius r of the helical path. (Pitch is the distance it moves forward during a period.)