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  4. Two identical thin bar magnets each of length l and pole strength m are placed at right angles to each other with north pole of one touching south pole of other, the magnetic moment of the system is

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Q. Two identical thin bar magnets each of length $l$ and pole strength $m$ are placed at right angles to each other with north pole of one touching south pole of other, the magnetic moment of the system is

Magnetism and Matter

Solution:

Here, distance between two poles $=\sqrt{2} l$
Hence, $M=m \times \sqrt{2} l=\sqrt{2}\, m l$

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