1. A charged particle is traveling through a uniform magnetic field. Which of the following statements are true of the magnetic field?
举一反三
- 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.
- 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.
- A small piece of ferromagnetic media (the relative permeability is much greater than 1) is placed in a vacuum uniform magnetic field. Compared with the surrounding magnetic field, the magnetic strength in the media will ________, the magnetic field strength will __________. A: increase; increase B: increase; decrease C: decrease; decrease D: decrease; increase
- 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
- Which of the following statements about England is true? </p></p>
内容
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An inductor stores energy in a magnetic field _________ an electric field.
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Let p(x)= x3+(5m+1)x+5n+1, where m,n are integers. Which of the following statements is not true?( ) A: Q[x]/ is field. B: p(x) is irreducible over Q[x] C: x+ has multiplicative inverse in Q[x]/. D: Q[x]/ is an integer domain but not a field
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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
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Which of the following statements is NOT true about English according to this passage? </p></p>
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Microwave oven uses electromagnetic wave to heat food. Suppose the space inside the oven can be treated as free space. If the electric field at point P in the oven is measured to be [img=144x45]18033d924610386.png[/img], then the magnetic field at point P at the same moment is B=_________T.