词汇与结构We have to adjust heading to follow the course due to the existence of ________. A: magnetic north B: magnetic influence C: magnetic variation D: magnetic difference

Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）. A: Heeling magnet B: Flinders bar C: Fore-and-aft magnets D: All of the above can be set on magnetic east or magnetic west heading

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 ______.

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<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

There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。

A closed path followed by main magnetic flux is known as a ( ). A: Magnetic circuit B: Electric circuit C: Magnetic saturation circuit D: None of the above

Magnetic Flux Density B is a vector. While Magnetic Field Intensity H is not a vector.

There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。 A: 正确 B: 错误

With the help of suspended magnetic element, a compass can aid people by ______ of the horizontal component of Earth's magnetic field.