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NEET Sample Paper NEET Sample Test Paper-31

  • question_answer
    A short magnet of magnetic moment \[6.75\text{ }A-{{m}^{2}}\]is placed in horizontal plane in such a way that its north pole in south direction and south pole in north direction. If earth field is \[5\times {{10}^{-5}}\text{ }wb/{{m}^{2}}\]then the distance of neutral point from centre of magnet will be:-

    A)  10cm           

    B)  20 cm

    C)  30 cm           

    D)  40 cm

    Correct Answer: C

    Solution :

    \[\frac{2KM}{{{X}^{3}}}={{B}_{H}}\] \[X={{\left( \frac{2KM}{{{B}_{H}}} \right)}^{1/3}}\]


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