A square current loop with length a on each side carries a current I. The loop is in a uniform magnetic field B. If the loop is in the stable equilibrium, the magnetic flux passing through the loop onlyby the uniform field is ( ).
A: [img=30x22]1803a3748913c57.png[/img]
B: 0
C: [img=44x24]1803a37490df0b1.png[/img]
D: indeterminable
A: [img=30x22]1803a3748913c57.png[/img]
B: 0
C: [img=44x24]1803a37490df0b1.png[/img]
D: indeterminable
举一反三
- 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
- There exists an induced current flowing clockwise in the conducting loop shown in Figure. What is the direction of the magnetic field through the loop and how does the field vary in magnitude?[img=111x83]1803a3760763dd5.png[/img] A: Into the page and increasing. B: Into the page and decreasing. C: Into the page and steady. D: Out of the page and decreasing.
- 6. In a magnetic material, the ratio of the flux linkage through the loop to its loop current is ( ) A: Permeability B: Mutual inductance C: flux D: self-inductance
- In a uniform magnetic field, can an Amperian loop ever have a non-zero value of its line integral with the magnetic field? (You get only one try on this one!) A: Yes. B: No, it will always be zero. C: Depends on the orientation and shape of the loop.
- 在如图所示的匀强磁场中，已经标出了电流I和磁场B以及磁场对电流作用力F三者的方向，其中错误的是（ ）In the uniform magnetic field as shown in the figure, the directions of current I and magnetic flux density B and the magnetic force on current F have been marked, and the wrong one is ( ) A: [img=77x76]18035646b26abf1.png[/img] B: [img=72x74]18035646bd9ced2.png[/img] C: [img=97x71]18035646c9326e7.png[/img] D: [img=71x80]18035646d3b6dd2.png[/img]