Solution to task 446 from Chertov´s for extramural stud

Solution to task 446 from Chertov´s for extramural stud

446. Single charged lithium ion with mass m = 7 amu. e. m. passed the accelerating potential difference U = 300 V and flew into homogeneous magnetic and electric fields crossed at right angles. Determine the magnetic induction B of the field if the trajectory of the ion in the crossed fields is rectilinear. The electric field strength E is 2 kV / m.