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AIIMS AIIMS Solved Paper-2003

  • question_answer
    The earths magnetic field at a given point is \[0.5\,\times {{10}^{-5}}\,Wb\,\,{{m}^{-2}}\]. This field is to be annulled by magnetic induction at the centre of a circular conducting loop of radius 5.0 cm. The current required to be flown in the loop is nearly:

    A)  0.2 A 

    B)                                        0.4 A                    

    C)  4 A                        

    D)        40 A

    Correct Answer: B

    Solution :

    Magnetic field at the centre of a circular loop carrying current I is given by \[\beta \] where r is radius of circular loop. \[[{{M}^{-1}}L{{T}^{-2}}A]\]        \[[{{M}^{-2}}L{{T}^{-2}}{{A}^{-1}}]\] Given, \[[ML{{T}^{-2}}{{A}^{-2}}]\] \[[ML{{T}^{-1}}{{A}^{-1}}]\]  \[{{\beta }^{-}}\]


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