Solution to task 434 from Chertov´s for extramural stud

Solution to task 434 from Chertov´s for extramural stud

434. The alpha particle passed the accelerating potential difference U = 300 V and, hitting a uniform magnetic field, began to move along a helical line with a radius of R = 1 cm and a step h = 4 cm. Determine the magnetic induction B of the field.