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NEET Sample Paper NEET Sample Test Paper-23

  • question_answer
    The flux linked with a coil at any instant t is given by\[\phi =10{{t}^{2}}-50t+250.\] The induced emf at t = 3 s is

    A)  10 V              

    B)  190 V

    C)  -190 V                       

    D)  -10 V

    Correct Answer: D

    Solution :

    \[\varepsilon =-\frac{d\phi }{dt}\] \[=-\frac{d}{dt}(10{{t}^{2}}-50t+250)\] \[=-(20t-50)\] \[{{E}_{t=3s}}=-(20\times 3-50)V\] \[=-10\,V\] Hence, the correction option is [d].


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