举一反三
- The electron is not acted on by the force eE of the electric field. A: 正确 B: 错误
- An inductor stores energy in a magnetic field _________ an electric field.
- Both electric field E and electric potential V can describe the characteristics of a field. If the electric potential at a certain point is zero, the electric field at that point has to be zero.
- Which of the following explains why a magnetic field does no work on a moving charged particle?( ) A: The magnetic force depends on the speed of the particle. B: There is always an electric field that cancels the work done by the magnetic field. C: The magnetic force is always perpendicular to the direction of motion. D: The magnetic force depends on the direction of motion of the particle. E: The magnetic force is conservative.
- The Biot-Savart Law is used to（ ） A: determine the magnetic field created by an electric current B: determine the electric field created by an electric current C: determine the force 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
内容
- 0
The<br/>Biot-Savart Law is used to A: determine<br/>the electric field created by individual point charges B: determine<br/>the electric field created by an electric current C: determine<br/>the magnetic field created by individual point charges D: determine<br/>the magnetic field created by an electric current E: determine<br/>the force field created by an electric current
- 1
can be determined by the leT hand rule. A: The direc2on of the induced force on the moving charged par2cles in the magne2c field. B: The direc2on of the induced electro-mo2ve force on the moving conductor in the magne2c field C: The induced force on the moving charged par2cles in the magne2c field. D: The induced electromagneto mo2ve force on the moving conductor in the magne2c field.
- 2
1. A charged particle is traveling through a uniform magnetic field. Which of the following statements are true of the magnetic field? A: It exerts a force on the particle parallel to the field. B: It exerts a force on the particle along the direction of its motion. C: It increases the kinetic energy of the particle. D: It exerts a force that is perpendicular to the direction of motion.
- 3
An electron moves in the plane of this paper toward the top of the page. A magnetic field is also in the plane of the page and directed toward the right. What is the direction of the magnetic force on the electron? A: toward the top of the page B: toward the bottom of the page C: upward out of the page D: downward into the page
- 4
Ionic bonding is formed by ( ) A: valence electron transfer B: shared electron pair C: free electron and cation D: attraction of the electric dipoles