Solution to task 432 from Chertov´s for extramural stud

Solution to task 432 from Chertov´s for extramural stud

432. A singly charged sodium ion passed the accelerating potential difference U = 1 kV and flew perpendicular to the lines of magnetic induction into a uniform field (B = 0.5 T). Determine the relative atomic mass A of the ion if it has described a circle with a radius of R = 4.37 cm.