What can be said about the field
A: The field is left unplanted.
B: The field is lying waste.
C: The field is left open to playing.
D: The field is played with this year,
A: The field is left unplanted.
B: The field is lying waste.
C: The field is left open to playing.
D: The field is played with this year,
举一反三
- 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
- The type of field generated by a DC tacho-generator is A: pulsating magnetic field B: static field C: rotating field D: do not need field
- 他们扛着锄头下地了。can be translated into They left for the field, shouldering hoes.
- 中国大学MOOC: "他们扛着锄头下地了。"can be translated into "They left for the field, shouldering hoes."
- 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