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

  • question_answer
    If area vector \[\overrightarrow{A}=3\widehat{i}+2\hat{j}+5\hat{k}\,{{m}^{2}}\], flux density \[\overrightarrow{B}=5\widehat{i}+10\hat{j}+6\hat{k}\,(Wb/{{m}^{2}})\]. The magnetic flux linked with the soil is:

    A) 31 Wb                          

    B) 65 Wb 

    C) 100 Wb                        

    D) 90 Wb

    Correct Answer: B

    Solution :

    (b) 65 Wb \[\phi =\overrightarrow{B}\cdot \overrightarrow{A}=(5\widehat{i}+10\widehat{j}+6\widehat{k})\cdot \left( 3\widehat{i}+2\widehat{i}+5\widehat{k} \right)\]  \[=15+20+30=65\text{ }Wb\]


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