12th Class Physics Sample Paper Physics Olympiad Sample Paper-3

  • question_answer Two short bar magnets have magnetic moments \[1.20\,\,A\,\,{{m}^{2}}\] and \[1.00\,\,A\,\,{{m}^{2}}\] respectively. They are placed on horizontal table parallel to each other with their north poles pointing towards the south. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the Mid - point 0 of the line joining their centres is (horizontal component of the Earth's magnetic induction is \[3.6\times {{10}^{-5}}Wb/{{m}^{2}})\]

    A)  \[3.6\times {{10}^{-5}}Wb/{{m}^{2}}\]      

    B)    \[2.56\times {{10}^{-4}}Wb/{{m}^{2}}\]

    C)  \[3.50\times {{10}^{-4}}Wb/{{m}^{2}}\]

    D)  \[5.80\times {{10}^{-4}}Wb/{{m}^{2}}\]

    Correct Answer: B

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