本题目来源于试卷: Maxwell Equations，类别为 美国物理杯赛(Physics Bowl)
[单选题]
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A. work is required to move a magnetic pole through a closed path surrounding a current.
B. a time-changing electric field acts as a current and produces a magnetic field.
C. the speed of light could be determined from simple electrostatic and magnetostatic experiments and finding the values of $\mu_0$ and $\varepsilon_0$
D. the magnetic force on a moving charge particle is perpendicular to both its velocity and the magnetic field.
E. magnetism could be explained in terms of circulating currents in atoms.
参考答案: B
本题详细解析:
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