일반물리학 2 — Magnetic Fields: Problem 27

27 A positron with kinetic energy 950 eV is projected into a uniform magnetic field \(\vec{B}\) of magnitude 0.732 T, with its velocity vector making an angle of 89.0° with \(\vec{B}\). Find (a) the period, (b) the pitch p, and (c) the radius r of its helical path.