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NEET2009PhysicsMagnetic Properties of MatterActual

A bar magnet having a magnetic movement of 2 10^4 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 taking the magnet slowly from a direction parallel to the field to a direction 60^ from the field is :

Options

  1. A2 ~J
  2. B0.6 ~J
  3. C12 ~J
  4. D6 ~J

Correct answer

D. 6 ~J

Step-by-step solution

aligned W & = MB ( ₁- ₂ ) & =2 10^4 6 10⁻⁴ ( - 60^ ) & =12 1 2 =6 ~J aligned

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