NEET Sample Paper NEET Sample Test Paper-51

  • question_answer 11) In a coil rate of change of area is  \[5\text{ }{{m}^{2}}/\text{ }millisecond\] and current becomes 1 amp from 2 amp in \[2\,\,\times \,\,{{10}^{-}}^{3}\] sec. If magnitude of field is 1 tesla then self-inductance of the coil is

    A) 2 H                              

    B) 5 H

    C) 20 H                

    D) 10 H

    Correct Answer: D

    Solution :

    \[e=L\frac{dI}{dt}\,\,\Rightarrow \,\,e=B\frac{dA}{dt}\] \[B\frac{dA}{dt}=L\frac{dI}{dt}\]

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