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Magnetism

Cool goIITian

Joined:	13 Aug 2011
Post:	41

12 Jan 2012 14:16:38 IST

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239

EMI

Physics

2 circular loops of equal radii are placed coaxially at some separation.
The first is cut and a battery is inserted to drive a curent in it .
The current changes slightly due to the variation in resistance with temperature.
During this period , the loops ,

[a]attract each oder

[b) Repel each oder

[c] do not exert any force on each oder

[d]attract or repel each other depending on the sense of the current .

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Comments (3)

abhishek

Cool goIITian

Joined: 9 Oct 2011

Posts: 47

17 Jan 2012 19:03:35 IST

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repel

Arjun Virmani

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Joined: 1 Jun 2009

Posts: 1294

21 Jan 2012 15:20:24 IST

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The Lenz Law says that:

An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the original change in magnetic flux.

In this case we have zero flux...

and now as the current will pass thru one it will create a magnetic field and thrfr flux thru every loop near-by and thrfr there will change in flux and to oppose this change the loop will try to escape from the magnetic field end thrfr REPEL each other!!!!!

abhishek

Cool goIITian

Joined: 9 Oct 2011

Posts: 47

21 Jan 2012 16:15:17 IST

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yipeeee

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