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NEET Sample Paper NEET Sample Test Paper-84

  • question_answer
    A 25 cm long solenoid has radius 2 cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to a magnet of the same size and magnetization \[\vec{M}\] (magnetic moment/ volume), then \[\left| \overrightarrow{M} \right|\] is

    A) \[30000\pi A{{m}^{-1}}\]

    B)        \[3\pi A{{m}^{-1}}\]

    C) \[30000A{{m}^{-1}}\] 

    D)        \[300A{{m}^{-1}}\]

    Correct Answer: C

    Solution :

    [c] \[\overrightarrow{M}\] (mag. moment/volume) \[=\frac{NiA}{A\ell }\] \[=\frac{Ni}{\ell }=\frac{(500)15}{25\times {{10}^{-2}}}=30000\,\,A{{m}^{-1}}\]


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