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JEE Main & Advanced Physics Alternating Current / प्रत्यावर्ती धारा Question Bank Alternating Current, Voltage and Power

  • question_answer
    If an alternating voltage is represented as            \[E=141\sin (628\,t),\] then the rms value of the voltage and the frequency are respectively           [Kerala PET 2005]

    A)            \[141V,\,628Hz\]                

    B)            \[100V,\,50Hz\]                  

    C)            \[100V,\,100Hz\]                

    D)            \[141V,\,\,100Hz\]

    Correct Answer: C

    Solution :

                       \[E=141\sin (628\,t),\]             \[{{E}_{rms}}=\frac{{{E}_{0}}}{\sqrt{2}}=\frac{141}{1.41}=100V\]and \[2\pi f=628\]            Þ \[f=100Hz\]


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