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

  • question_answer
    A solenoid coil of 200 turns/m is carrying a current of 3 A. The length of the solenoid is 0.2 m and has a diameter of 1 cm. The magnitude of the magnetic field inside the solenoid is:

    A) \[12\pi \times {{10}^{-5}}T\]                

    B) \[24\pi \times {{10}^{-5}}T\]

    C) \[12\pi \times {{10}^{-4}}T\]                

    D) \[48\pi \times {{10}^{-6}}T\]

    Correct Answer: B

    Solution :

    (b) \[24\pi \times {{10}^{-5}}T\]                         \[B={{\mu }_{0}}nl\]             \[=4\pi \times {{10}^{-7}}\times 200\times 3=24\pi \times {{10}^{-5}}T\]


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