試卷名稱:114年 - 114 國立清華大學_學士後醫學系_自然科學組﹕物理化學#126266
年份:114年
科目:學士後西醫物理及化學
41. A long, straight conductor carries 1.0 A of current. At what distance from the axis of the conductor is the magnetic field caused by the current equal to the Earth's magnetic field (about 0.5 Gauss)? μ0 = 4π ×
T·m/A
(A) 200 mm
(B) 40 mm
(C) 20 mm
(D) 4 mm
(E) 1 mm