試題詳解

56. It is known that the magnetic field of 0.17 T can cause an ion to move in a circular orbit of radius 2 m. Find the radius of circular orbit of a ion with identical velocity in the same magnetic field. (Ion moves in direction perpendicular to the magnetic field.)
(A) 0.12 m
(B) 0.25 m
(C) 0.34 m
(D) 0.52 m
(E) 0.72 m