An inward uniform magnetic field B is decreasing and a loop of wire is in the field. For the result of the electromagnetic induction, which of the following statements is correct?[img=119x108]1803a37611f4625.png[/img]
A: The potential of end A is higher than that of C.
B: The potential of end A is lower than that of C.
C: The potential of end A is the same as that of C.
D: Potential does not exist due to the absence of an electrostatic field.
A: The potential of end A is higher than that of C.
B: The potential of end A is lower than that of C.
C: The potential of end A is the same as that of C.
D: Potential does not exist due to the absence of an electrostatic field.
举一反三
- Both electric field E and electric potential V can describe the characteristics of a field. If the electric potential at a certain point is zero, the electric field at that point has to be zero.
- Which statement as follows is right? A: The potential equals everywhere the magnitude of electric field intensity is equal. B: The magnitude of electric field intensity equals everywhere the potential is equal. C: The potential must be high where the magnitude of electric field intensity is great. D: The potential is not necessarily zero where the magnitude of electric field equals zero.
- <p><p>1. A charged particle is traveling through a uniform magnetic field. Which of the following statements are true of the magnetic field? </p></p>
- 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
- 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