A point charge q is placed inside a cavity within a conductor. The conductor is electrically neutral and is isolated . The total charge on the outer surface of the conductor must be ______.
A point charge q is placed inside a cavity within a conductor. The conductor is electrically neutral and is isolated . The total charge on the outer surface of the conductor must be ______.
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.
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.
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
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
When these electromagnetic waves escape from the conductor into space, they are said to be radiated by the conductor, hence the name radio waves.
When these electromagnetic waves escape from the conductor into space, they are said to be radiated by the conductor, hence the name radio waves.
The train conductor ______ our tickets.
The train conductor ______ our tickets.
The magnentic field is generated by A: voltage applied to the conductor B: current through the conductor C: charge shifts D: permanent magnet
The magnentic field is generated by A: voltage applied to the conductor B: current through the conductor C: charge shifts D: permanent magnet
中国大学MOOC: A conductor in electrostatic field is an equipotential body, any two points on the conductor have the same electric potential.
中国大学MOOC: A conductor in electrostatic field is an equipotential body, any two points on the conductor have the same electric potential.
A conductor in electrostatic field is an equipotential body, any two points on the conductor have the same electric potential. A: 正确 B: 错误
A conductor in electrostatic field is an equipotential body, any two points on the conductor have the same electric potential. A: 正确 B: 错误
On the surface of a perfect conductor, the normal component of the electric displacement vector is A: continuous with the normal component of the electric displacement vector inside the conductor B: uncertain C: equal to the surface density of free charge on the conductor surface. D: equal to zero
On the surface of a perfect conductor, the normal component of the electric displacement vector is A: continuous with the normal component of the electric displacement vector inside the conductor B: uncertain C: equal to the surface density of free charge on the conductor surface. D: equal to zero
5.On the ideal conductor surface, the relationship between the electric field line and the conductor surface is ( ) A: Vertical B: Parallel C: is zero D: not sure
5.On the ideal conductor surface, the relationship between the electric field line and the conductor surface is ( ) A: Vertical B: Parallel C: is zero D: not sure