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AMU Medical AMU Solved Paper-2011

  • question_answer
    A closely wound solenoid 80 cm long has 5 layers of winding of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, the magnitude of B inside the solenoid near its centre will be

    A)  \[8\pi \times {{10}^{-3}}T\]                        

    B)  \[6\pi \times {{10}^{-3}}T\]

    C) \[p-n\]                                 

    D)  \[3\pi \times {{10}^{-3}}T\]

    Correct Answer: C

    Solution :

                     Magnetic field                 \[B=\frac{{{\mu }_{0}}i}{4\pi }\frac{5N}{l}(2\pi )\]                 \[={{10}^{-7}}\times 8\times 5\times \frac{400\times 2\pi }{80\times {{10}^{-2}}}\]                 \[=4\pi \times {{10}^{-3}}T\]


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