Current location - Plastic Surgery and Aesthetics Network - Plastic surgery and beauty - (20 14? Superconduction is a wonderful phenomenon of some metals or alloys at low temperature, which has a very wide range of applications in real life.
(20 14? Superconduction is a wonderful phenomenon of some metals or alloys at low temperature, which has a very wide range of applications in real life.
(1) According to Ampere's law, there is an N-pole below the superconducting ring, which repel each other, and the strong magnetic pole is also an N-pole;

So the strong magnetic pole is n pole;

(2) The stress analysis of the circular ring can be equivalent to a straight steel wire, and the vertical direction is as follows

Mg=F amp cos60 = BILcos60;;

Ring circumference l = 2πr = 0.8m;;

Substituting the above formula can get b = 25t.

Therefore, the magnetic induction intensity at the ring is 25T;;

(3) The descending process of the ring is governed by the law of conservation of energy.

mgh = I2Rt = I2ρlSt;

Substitute data ρ= 1.25× 10-4ω? m;

Therefore, the resistivity of superconducting ring is about 1.25× 10-4ω? m;

Answer: (1) The strong magnetic pole is N pole;

(2) The magnetic induction intensity at the ring is 25T;;

(3) The resistivity of superconducting ring is about 1.25× 10-4ω? Meter (short for meter))