Each Second, 1

Each second, 1.25 × 10¹⁹ electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

A) 1.18 × 10^-9 T
B) 5.34 × 10^-7 T
C) 2.62 × 10^-3 T
D) 4.14 × 10⁸ T
E) 3.33 × 10¹² T