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 × 10⁻⁴ T exists in the space. The work done in taking the
magnet slowly from a direction parallel to the field to a direction
60° from the field is
(a) 12 J (b) 6 J
(c) 2 J (d) 0.6 J
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