Two identical thin bar magnets each of length \( l \) and pole stre...

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Two identical thin bar magnets each of length \( l \) and pole strength \( m \) are placed at right angle to each other with north pole of one touching south pole of the other. Magnetic moment of the system is
(1) \( m l \)
(2) \( 2 m l \)
(3) \( \sqrt{2} \mathrm{ml} \)
(4) \( \frac{1}{2} m l \)
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