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A bar magnet of length 14 cm is placed along N-S direction with north of magnetic along north direction. If horizontal component of earth magnetic field is 0.4 G. If at distance 18 cm from centre of magnet a null point is located. Then magnetic moment of magnet is :

(1) 2.88 Am2 (2) 1.88 Am2 (3) 4.88 Am2 (4) 3.88 Am2

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The correct option is 1) 2.88 Am

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