The magnentic field is generated by
A: voltage applied to the conductor
B: current through the conductor
C: charge shifts
D: permanent magnet
A: voltage applied to the conductor
B: current through the conductor
C: charge shifts
D: permanent magnet
举一反三
- There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。
- On the ideal conductor surface, the relationship between the electric field lines and the conductor surface is A: the electric field lines is always pertendicular to the conductor surface. B: the electric field lines is always parallel to the conductor surface. C: there is no electri field lines exsited. D: unable to determine the relationship.
- To his surprise, the electric current flows through a conductor ________________________ (就好像液体一样).
- Electric current flows through a conductor (导体) as though it _____ a fluid (流体). A: be B: is C: were D: was
- Which of the following statements about a conductor in the static case is not true导体在静电平衡下表述不正确的是 A: The conductor must be at the same electric potential B: The surface of the conductor is an equi-potential surface等势面 C: There can be an electric field within the conductor导体内 D: There can be no net charge within the conductor体内无净电荷