Задача 30177.

An alpha particle, having accelerating potential difference U = 50 kV, flew in a uniform magnetic field with induction B = 0,5Tl and began to gyrate with step h = 37cm. To determine the radius of the spiral R.

Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
If you have any questions to address, please. I try to help.