A. placing the magnetic needles around the magnet B. determining the polarity of the magnet C. drawing the magnetic field lines D. changing the distance between the magnetic needles 相关知识点: 试题来源: 解析 B。解析:在关于磁场线的实验中,首先要确定磁铁的极性。选项A,在磁铁周围放置磁针是在确...
A laboratory experiment on the reconnection of magnetic field lines in plasmas has been performed. A large-volume stationary plasma is produced and a time-varying magnetic field is applied to it. In vacuum the field exhibits an X-type neutral point on axis. Because of the time variation, ...
Unless the magnetic field is mapped using a compass, the direction of the magnetic field may be unknown. By convention, direction is indicated by drawing arrowheads along magnetic field lines. In any magnetic field, the lines always flow from the north pole to the south pole. The names "nort...
We find that the experimental results agree well with numerical simulations based on mean field theory and confirm the intuitive explanation of the spin-switch mechanism given above. Results Experimental realization of a unidirectional spin switch In the experiment, a BEC composed of 7 × 105 ...
The magnetic hyperfine field is usually antiparallel to the magnetic moment of the iron ions. The electrostatic interaction between the electric quadrupole moment of a nonspherical nucleus and the electric field gradient due to the surrounding charges can result in shifts of the six lines of spectra...
展开 关键词: magnetic fields power overhead lines current dipole moment induced current estimation miniature transmission line model experiment mitigation effectiveness overhead power lines passive loop conductor power line magnetic field mitigation right of way DOI...
In the magnetic case, however, the force FM is not in the direction of the field vector B, nor is it in the direction of the velocity vector v: FM is perpendicular to both B and v. We can see the relationship among these three vectors in the following simple experiment. Suppose that...
This finding was unexpected as, after isolation of G2-11 from a paddy field more than 20 years ago, no magnetosome formation has been reported [26]. Furthermore, no MTB has been identified so far among phototrophs or within the Acetobacteraceae family to which G2-11 belongs [26] (...
weak magnetic field comprises a pair of rigidly connected spaced apart superconducting rings R 1 , R 2 , each ring comprising a pair of insulating barriers (Josephson junctions) J 1 , J 2 , the maximum tunnelling current through which varies as a periodic function of magnetic field strength....
4c for the two considered cases (see the sharper gradient of the magnetic field reversal around y = 0 for the θ = 15∘ case). The sharper gradient in the tilted case then drives the mouth-shaped structure of the proton radiography, both observed in the experiment and in the ...