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JEE Main & Advanced JEE Main Paper (Held On 12 May 2012)

  • question_answer
    Magnetic flux through a coil of resistance \[10\Omega \]is changed by \[\Delta \phi \]in 0.1 s. The resulting current in the coil varies with time as shown in the figure. Then\[|\Delta \phi |\]is equal to (in weber)   JEE Main Online Paper (Held On 12 May 2012)

    A) 6                                             

    B)                        4

    C)                        2    

    D)                        8

    Correct Answer: C

    Solution :

                     As \[e=\frac{\Delta \phi }{\Delta t}\]or\[Ri=\frac{\Delta \phi }{\Delta t}\left( \because e=Ri \right)\] \[\Rightarrow \]\[\Delta \phi =R(i.\Delta t)\] \[=R\times \]area under i-t graph \[=10\times \frac{1}{2}\times 4\times 0.1=2\]we ber                                


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