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JEE Main & Advanced Physics Magnetism Question Bank Magnet and its Properties

  • question_answer
    A bar magnet of magnetic moment 3.0 A-m2 is placed in a uniform magnetic induction field of 2 ´ 10?5 T. If each pole of the magnet experiences a force of 6 ´ 10?4 N, the length of the magnet is       [EAMCET (Med.) 2000]

    A)            0.5 m                                       

    B)            0.3 m

    C)            0.2 m                                       

    D)            0.1 m

    Correct Answer: D

    Solution :

                       \[F=mB\Rightarrow F=\frac{M}{L}\times B\]            \[\Rightarrow 6\times {{10}^{-4}}=\frac{3}{L}\times 2\times {{10}^{-5}}\Rightarrow L=0.1\ m.\]


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