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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2009

  • question_answer
    Magnet moment of bar magnet is M. The work done to turn the magnet by\[90{}^\circ \]of magnet in direction of magnetic field B will be

    A)  zero             

    B) \[\frac{1}{2}\]MB

    C)  2 MB          

    D)  MB

    Correct Answer: B

    Solution :

     Work done, \[W=MB(1-cos\theta )\] \[\theta =90{}^\circ \] \[\therefore \] \[W=MB\]


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