Physics Asked by Nevil on October 2, 2020
When Current passes thru a spring , some books mention that it gets compressed.
However, I think due to the heating effect of current, molecules will increase kinetic energy and the spring should get elongated. What is the physical mechanism for the compression instead of elongation?
A probable solution may be: There exists a heating Effect, but it's almost negligible to the compression Effect. Consider a spring which actually is like circular loop of many turns. Since current will flow in the same direction, even direction of magnetic field too will be the same. Thus dipole will be created on each loop, and they will attract each other.
Answered by Nevil on October 2, 2020
The current in the wire creates a magnetic field. The magnetic field from each loop puts a force on the other wire loops that makes them compress together.
Answered by Daddyo on October 2, 2020
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