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12th Class Physics Electro Magnetic Induction Question Bank MCQ - Electromagnetic Induction

  • question_answer
    A 2 m Long metallic rod rotates with an angular frequency of \[200\text{ }rad\text{ }{{s}^{-1}}\] about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant magnetic field of 0.5 T parallel to the axis exists everywhere. The emf developed between the centre and the ring is:

    A) 100 V                           

    B) 200 V  

    C) 300 V                           

    D) 400 V

    Correct Answer: B

    Solution :

    (b) 200 V The emf d eveloped between the centre and the ring is \[\varepsilon =\frac{1}{2}B{{l}^{2}}\omega =\frac{0.5\times (2)\times 200}{2}=200\,V\]


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