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NEET Sample Paper NEET Sample Test Paper-7

  • question_answer
    A straight wire of mass 200g and length \[1.5m\] caries a current of 2A. It is suspended in mid-air by a uniform horizontal magnetic field B. The magnitude of B (in tesla) is\[(g=9.8\,m{{s}^{-2}})\] :

    A)  2                                

    B)  \[1.5\]

    C)  \[0.55\]                       

    D)  \[0.66\]

    Correct Answer: D

    Solution :

    As force on the wire, will must equal to its weight i.e.              \[ilB=mg\] \[\Rightarrow \]            \[B=\frac{mg}{il}=0.66T\]


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