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A bar magnet having a magnetic moment of 2×104 JT-1 is free to rotate in a horizontal plane. A horizontal magnetic field B=6×10-4T exists in the space. The work done in talking the magnet slowly from a direction parallel to the field to a direction 60° from the field is 

(a) 0.6 J                            (b) 12 J

(c) 6 J                               (d) 2 J

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