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NEET AIPMT SOLVED PAPER MAINS 2011

  • question_answer
    A short bar magnet of magnetic moment \[0.4J\,{{T}^{-1}}\]is place in a uniform magnetic field of 0.16 T. The magnet is stable equilibrium when the potential energy is                                                           

    A)  -0.64J                  

    B)  zero                     

    C)  - 0.082 J        

    D)  0.064 J

    Correct Answer: D

    Solution :

    We know that\[U=-MB\cos \theta \] For stable equilibrium\[\theta ={{0}^{o}}\] So,\[U=-MB\] \[=-(0.4)(0.16)=-0.064\,\text{J}\]


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