12th Class Physics Magnetic Effects of Current / करंट का चुंबकीय प्रभाव Question Bank MCQs - Magnetism and Matter

  • question_answer
    Ratio of total intensity of magnetic field at equator to poles is

    A) 1:1

    B) 1:2

    C) 2:1

    D) None of the above

    Correct Answer: A

    Solution :

    Option [a] is correct
    Explanation:\[{{\operatorname{B}}_{H}}=Bsin\theta \]
    \[{{\operatorname{B}}_{V}}=Bsin\delta \] 
    At equator, \[\delta \] = \[{{0}^{\operatorname{o}}}\].                       
    So, \[{{\operatorname{B}}_{H}}\] = B, \[{{\operatorname{B}}_{\operatorname{V}}}\] = \[{{90}^{\operatorname{o}}}\]
    At poles, \[\delta \] =\[{{90}^{\operatorname{o}}}\].
    So, \[{{\operatorname{B}}_{H}}\]=B,\[{{\operatorname{B}}_{\operatorname{V}}}\]=B                 
    So, the ratio of total intensity of magnetic field at equator to poles is 1: 1.


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