Electromagnetic force

2011-03-19 4:37 am

圖片參考:http://imgcld.yimg.com/8/n/HA00270495/o/701103180098713873391730.jpg

根番上面幅圖,x代表磁場指入紙面,如果conduct既resistance tends to 0,咁f=ilb,magnetic force咪tends to infinity?
咁如果搵舊超導體,

回答 (1)

2011-03-19 7:25 am
✔ 最佳答案
The magnetic force depends on the magnetic flux density (B) and the current (I). As long as the current is not infinitely large, the magnetic force is finite.

In case a superconductor is used, the current could be maintained at a large value. But energy is needed to keep the conductor at a low temperature, hence there is no violation to energy conservation.


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