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.
举一反三
- (<br/>) can be determined by the left hand rule. A: The induced force on the moving charged particles in the magnetic<br/>field. B: The direction of the induced force on the moving charged particles in<br/>the magnetic field. C: The induced electromagneto motive force on the moving conductor in<br/>the magnetic field. D: The direction of the induced electro-motive force on the moving<br/>conductor in the magnetic field.
- 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.
- 导体切割磁场线，没有构成闭合回路的话，那么___The conductor cuts the magnetic field line without forming a closed loop, then___ A: 没有感应电流，没有电动势；no induced current, no electromotive force; B: 没有感应电流，有电动势；there is no induced current and there is an electromotive force; C: 有感应电流，没有电动势；there is an induced current and no electromotive force; D: 有感应电流，有电动势；there is an induced current and an electromotive force;
- It is found more convenient to adopt the point of view that a moving charge sets up a magnetic field, _____ that this field exerts a force on another charge moving through it. A: and B: or C: that D: but
- 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.
内容
- 0
A circular loop of wire is held in a uniform magnetic field, with the plane of the loop perpendicular to the field lines. Which of the following will not cause a current to be induced in the loop? A: crushing the loop B: rotating the loop about an axis perpendicular to the field lines C: keeping the orientation of the loop fixed and moving it along the field lines D: pulling the loop out of the field
- 1
For a magne2c circuit with air gap, if the magneto-mo2ve force remains unchanged and the air gap length is increased (Rm increases), the magne2c flux in the air gap will ( ). A: not sure B: decrease C: increase D: remain the same
- 2
If the magnetic field B through<br/>a loop of wire is increasing, the<br/>induced magnetic field will be A: in<br/>the same direction as B B: in<br/>the opposite direction as B C: perpendicular<br/>to B D: at<br/>an acute angle to B E: there<br/>is no induced magnetic field
- 3
Semiconductor<br/>with a current is placed in a magnetic field perpendicular to the<br/>current and it induced electric field in the direction. This<br/>phenomenon is known as the ______ .
- 4
5) Which one of the glowing magnetic field gives the largest magnitude? A: the field 2 cm away from a long, straight wire carrying a current of 3 A B: the field at the center of a flat, compact, circular coil, 2 cm in radius, with 10 turns, carrying a current of 0.3 A C: the field at the center of a solenoid 2 cm in radius and 200 cm long, with 1000 turns, carrying a current of 0.3A D: the field at the center of a long, straight, metal bar, 2 cm in radius, carrying a current of 300 A E: a field of 1 mT