2. Questions Bank
  3. 12th Class
  4. Physics
  5. Magnetism

12th Class Physics Magnetism Question Bank MCQ - Magnetism and Matter

  • question_answer
    A closely wound solenoid of 3000 turns and area of cross- section \[2\times {{10}^{-4}}{{m}^{2}}\], carrying a current of 6 A is suspended through its centre allowing it to turn in a horizontal plane. The magnetic moment associated with this solenoid is: 

    A) \[1.2\,J{{T}^{-1}}\]                 

    B)             \[2.4\,J\,{{T}^{-1}}\]   

    C)             \[3.0\text{ }J\text{ }{{T}^{-1}}\]                     

    D)             \[3.6\text{ }J\text{ }{{T}^{-1}}\]

    Correct Answer: D

    Solution :

    (d) \[3.6\text{ }J\text{ }{{T}^{-1}}\] Here,\[N=3000,\text{ }A=2\times {{10}^{-4}}{{m}^{2}},l=6A\]                   \[\therefore \,\,\,M=NlA=3000\times 6\times 2\times {{10}^{-4}}=3.6\text{ }J{{T}^{-1}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner