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?
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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.
Daddyo
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Put your right thumb parallel to the current in a segment of wire in one of the loops. The magnetic field wraps around the wire just just like your fingers wrap around it. That is Ampere's Law. That field crosses other loops at right angles and causes a force F = I X B. That is Lorentz' Law. – Daddyo Apr 12 '19 at 15:49
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Yeah. Wires carrying current in the same direction are attracted towards each other. – Sidarth Sep 13 '20 at 06:12
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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.
There exists Heating Effect .. but its olmost neglible 2 d compression wic h takes place
Consider a spring .. which actli is like circular loop of many turns Since , current will flow in same direction , even Directn of magnetic field too will be same Thus .. Dipole will b created on each loop n dey will attract each oder
– Nevil Oct 21 '12 at 15:58