A bar magnet with magnetic moment 2.5×10³ JT⁻¹ is rotating in horizontal plane in the space containing magnetic induction B=4×10⁻⁵ T. The work done in rotating the magnet slowly from a direction parallel to the field to a direction 45⁰ from the field, is (in joule)

Options

(a) 0
(b) 0.2
(c) 0.03
(d) 0.02

Correct Answer:

0.03

Explanation:

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