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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    When 4 A current flows in a motor, the power loss in 20 W and the resultant potential difference is 220 V, emf will be

    A)  220 V           

    B)  225 V

    C)  240 V           

    D)  260 V

    Correct Answer: B

    Solution :

     The resultant of potential differnece \[V=E-IR\] or     \[E=V+IR\] or \[E=V+I\times \frac{P}{{{I}^{2}}}\] or    \[E=V+I\times \frac{P}{{{I}^{2}}}\] \[E=220+4\times \frac{20}{{{(4)}^{2}}}\] \[=225\,V\]


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