A: A; a
B: The; the
C: A; the
D: the; /
举一反三
- _____ magnet in a magnetic field will be subject to _____ force. A: A; a B: The; the C: A; the D: the; /
- 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.
- 14. The magnetic compass magnets are acted on by the horizontal component of the Earth's total magnetic force. This magnetic force is GREATEST at the ______.
- 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
- 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
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
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.
- 2
The curl equation [img=154x44]1803a2a153c85f5.png[/img]shows that : A: The time-varying magnetic field can generate an electric field, in which the elecric field lines is closed around the magnetic field line. B: The time-varying magnetic field can generate a magneitc field, in which the magnetic field lines is closed around the electric field line. C: The magnetic field lines is closed themselves. D: Flux continuity
- 3
The<br/>magnetic field lines are used to visually describe the distribution<br/>of the magnetic field around the magnet. For the following<br/>statement,( <br/>) is wrong. A: Each<br/>magnetic field line is a closed loop curve B: No<br/>two magnetic field lines can cross each other C: The<br/>length of the magnetic field line reflects the strength of the<br/>magnetic field D: The<br/>tangential direction of any point on any of the magnetic lines is the<br/>direction of the magnetic field at that point
- 4
_______________every magnet is surrounded by a magnetic field.