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

  • question_answer
    A solenoid has 1000 turns per metre length. If a current of 5 A is flowing through it, then magnetic field inside the solenoid is:

    A) \[2\pi \times {{10}^{-3}}T\]                  

    B) \[2\pi \times {{10}^{-5}}T\]

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

    D) \[4\pi \times {{10}^{-5}}T\]

    Correct Answer: A

    Solution :

    (a) \[2\pi \times {{10}^{-3}}T\] \[B={{\mu }_{0}}nl=4\pi \times {{10}^{-7}}\times 5\times 1000=2\pi \times {{10}^{-3}}T.\]


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