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12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
    A straight wire carrying a current of 13 A is bent into a semi-circular arc of radius 2 cm as shown in figure. The magnetic field is \[1.5\times {{10}^{-4}}T\] at the centre of arc, then the magnetic field due to straight segment is:

    A) \[1.5\times {{10}^{-4}}T\]                   

    B) \[2.5\times {{10}^{-4}}T\]

    C) zero                              

    D) \[3\times {{10}^{-4}}T\]

    Correct Answer: C

    Solution :

    (c) zero.                                                 Since dl and r for each element of the straight segments are parallel. Therefore                                        \[\overrightarrow{dl}\times \overrightarrow{r}=0\]              Hence. B is also zero.


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