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NEET Sample Paper NEET Sample Test Paper-42

  • question_answer
    A coil of resistance \[400\Omega \] is placed in a magnetic field If the magnetic \[\operatorname{flu}x\text{ }\phi \left( Wb \right)\] linked with the coil varies with time t(s) as \[\phi \]\[=50{{t}^{2}}+4\], then current at 2s is:

    A) 0.5A                            

    B) 0.1A

    C) 2A                               

    D) 1A

    Correct Answer: A

    Solution :

    \[\phi =50{{t}^{2}}+4\] \[\operatorname{emf}=\frac{d\phi }{dt}=100t\] \[\operatorname{emf}\left( t=2s \right)=100\times 2=200V\] \[\operatorname{I}=\frac{E}{R}=\frac{200}{400}=0.5A\]


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