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Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2014)

  • question_answer
    The current flowing in a coil of self-inductance \[0.4\text{ }mH\]is increased by \[250\text{ }mA\]in\[0.1\text{ }s\]. The emf induced will be

    A) \[-1\,mV\]                    

    B)  \[-1\,V\]

    C)  \[+1\,mV\]                 

    D)  \[+1\,V\]

    Correct Answer: A

    Solution :

    \[e=-\frac{di}{dt}=-0.4\times {{10}^{-3}}\times \frac{250\times {{10}^{-3}}}{0.1}=-1\,mV\]


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