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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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I found d answer ... Its like this 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 –  user12694 Oct 21 '12 at 15:58
    
@user You are encouraged to answer your own questions for the benefit of future visitors and so that other user can vote on the answer that you have found. –  dmckee Oct 22 '12 at 15:38
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