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

  • question_answer
    A rectangular loop of area \[20\text{ }cm\times 30\text{ }cm\] is placed in a magnetic field of 0.3 T, with its plane normal to the field. The flux linked with the coil is:

    A) 0.009 Wb         

    B) 0.018 Wb

    C) zero                  

    D) 0.06 Wb

    Correct Answer: B

    Solution :

    (b) 0.018 Wb Loop area \[=l\times b=20\times 30=600\,c{{m}^{2}}\]                \[=0.06\,{{m}^{2}}\] \[B=0.3\text{ }T\] and \[\theta =90{}^\circ \]  (plane is normal to field) \[\therefore \phi =BA\,\cos \,\theta =0.06\times 0.3\times \cos \,90{}^\circ \]             \[=0.018\times 1=0.018\,Wb\]


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