Task 30923.

Determine the electron magnetic induction field at a point A located at a distance b from an electron in a direction which makes an angle alpha with the electron velocity vector. The rate of motion of the electron is equal to 10 ^ 5 m / s, the angle is determined by the formula alpha = N deg, b = N nm. Determine the circulation of the magnetic induction along the contour L, having an appearance of a circle passing through the point A. The plane of the circle perpendicular to the vector velocity of the electron, and the focus is on the electron trajectory.