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This current changing, the magnetic field will change as well.
发布时间:
2024-06-16 09:58:42
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相关试题
1.
The change in the flux density is caused by ____. 选项: A: the magnetic field which is expanding about the conductor B: the magnetic field which is collapsing about the conductor C: the current through a conductor which changes in magnitude D: Both A and B
2.
An infinitely large current-carrying sheet lies on the xy-plane carrying current in the y-direction. Which of the following is false about the magnetic field that it creates?( )选项: A:The magnetic field depends on the current density in the sheet. B:The magnetic field can be calculated using Ampere’s law. C:The magnetic field depends on the distance away from the plane. D:The magnetic field is in the positive x-direction.
3.
The magnetic field inside the magnetic medium is generated by both conduction current and polarization current.选项: A:正确; B:错误
4.
The Biot-Savart Law is used to( )选项: A:determine the electric field created by an electric current B:determine the force field created by an electric current C:determine the magnetic field created by an electric current D:determine the magnetic field created by individual point charges E:determine the electric field created by individual point charges
5.
A metal spring can be used as a solenoid. The spring is stretched slightly, and a current is passed through it. The resulting magnetic field will cause the spring to 选项: A、collapse (shorten) B、stretch (lengthen) C、not change (nothing happens) D、translate along the current direction
6.
The displacement current is actually made out of the time-varying magnetic field.
7.
The magnetic field(磁场) is produced by an electric current. (注意:被动句的译法)
8.
The inductor can store magnetic field energy, and the energy stored is related to ( ). 选项: A、inductance value B、voltage across the inductor C、current flowing through the inductor
9.
A charged particle is moving in a constant magnetic field. Assume that the magnetic field is not parallel or antiparallel to the velocity. Concerning the magnetic force exerted on the particle, which of the following statements is false?选项: A:It does no work on the particle.; B:It may increase the speed of the particle.; C:It may change the velocity of the particle.; D:It can act only on the particle while the particle is in motion.
10.
When a charged particle moves through a magnetic field, the direction of the magnetic force on the particle at a certain point is选项: A:in the direction of the magnetic field at that point.; B:opposite to the direction of the magnetic field at that point.; C:perpendicular to the magnetic field at that point.; D:none of the above; E:The answer depends on the sign of the particle’s electric charge.
11.
Which of the following statements concerning the earth’s magnetic field is completely correct? 选项: A: The earth’s magnetic field can be classified as transient, semi-permanent or permanent B: Dip is the angle between total magnetic field and vertical field component C: The blue pole of the earth’s magnetic field is situated in North Canada. D: At the earth’s magnetic equator, the inclination varies depending on whether the geographic equator is north or south of the magnetic equator
12.
A magnetic field exerts a non-zero force on a particle. Which of the following must be true? ( ) 选项: A、The particle is negatively charged. B、The particle is stationary. C、The direction of the force is perpendicular to both the velocity of the particle and the magnetic field. D、The direction of the force is parallel to the magnetic field but perpendicular to the motion of the particle. E、The direction of the force is perpendicular to the magnetic field but parallel to the motion of the particle.
13.
Regarding the variation, what are the characteristics of its change 选项: A、Change by place B、Change by time C、Change by the course alteration D、Geographical magnetic anomaly E、Magnetic storm
14.
Regarding the variation, what are the characteristics of its change 选项: A、Change by place B、Change by time C、Change by the course alteration D、Geographical magnetic anomaly E、Magnetic storm
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