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

  • question_answer
    A wire of length 50 cm moves with a velocity of 300 m/min, perpendicular to a magnetic field. If the emf induced in the wire is 2 V, then the magnitude of the field (in tesla) is:

    A) 2                     

    B) 5       

    C) 0.4                               

    D) 0.8

    Correct Answer: D

    Solution :

    (d) 0.8 Given \[l=50\text{ }cm=0.5\text{ }m\] \[\Rightarrow v=300\,m\,{{\min }^{-1}}\]             \[=\frac{300}{60}=5\,m{{s}^{-1}}\] and \[\varepsilon =2\,V\] Magnetic field, \[B=\frac{\varepsilon }{lv}=\frac{2}{0.5\times 5}=0.8\,T\]


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