It will not be necessary to calculate the component of the velocity perpendicular to (垂直于) the magnetic field(磁场).
举一反三
- 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 ______ .
- Electric field [img=14x24]1803a374c4e0b52.png[/img] and magnetic field [img=14x24]1803a374ccd1dcd.png[/img] are perpendicular to the particle’s velocity and to each other as shown in the figure. What is the speed that the particles must have when they leave the source for them to be able to pass through the very narrow and long field region? . (In form of / , if fraction)
- 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
- Permanent magnetism is caused by（）. A: operation of electrical equipment and generators on board ship B: the earth's magnetic field affecting the ship's hard iron during construction C: the horizontal component of the earth's magnetic field acting on the horizontal soft iron D: the vertical component of the earth's magnetic field acting on the vertical soft iro
- 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.