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BITSAT 2012
Exam
BITSAT
Year
2012
Subject
Physics
Chapter
Magnetic Effects of Current

BITSAT 2012 · Physics · Magnetic Effects of Current

Magnetic moment of bar magnet is M . The work done to turn the...

Magnetic moment of bar magnet is M\mathrm{M}. The work done to turn the magnet by 90∘90^{{}^{\circ}} of magnet in direction of magnetic field B\mathrm{B} will be

Options

  1. Azero
  2. B12MB\frac{1}{2} \mathrm{MB}
  3. C2MB2 \mathrm{MB}
  4. DMB\mathrm{MB}

Correct answer

D. MB\mathrm{MB}

Step-by-step solution

Work done, W=MB(1−cos⁡θ)θ=90∘W=MB\mathrm{W}=\mathrm{MB}(1-\cos \theta)\theta=90^{{}^{\circ}}\mathrm{W}=\mathrm{MB}
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