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BVP Medical BVP Medical Solved Paper-2011

  • question_answer
    The plates of a capacitor are charged to a potential difference of 320 V and are then connected across a resistor. The potential difference across the capacitor decays exponentially with time. After Is the potential difference between the plates of the capacitor is240 V, then after 2 and 3 s the potential difference between the plates will be

    A)  200 and 180 V                  

    B)  180 and 135 V

    C)  160 and 80 V                     

    D)  140 and 20 V

    Correct Answer: B

    Solution :

                    Decay equation of potential difference across capacitor \[y=5\sin \frac{\pi x}{3}\cos 40\pi t\]                 or            \[5\times {{10}^{14}}\]                 or            \[\overset{0}{\mathop{A}}\,\]                     ??..(i) For t =2s \[\overset{0}{\mathop{A}}\,\]        ??.(ii) \[\overset{0}{\mathop{A}}\,\]    [from Eq. (i)] Fort =3s                 \[\overset{0}{\mathop{A}}\,\]                 \[\mu \]                  ?...(iii) \[d\frac{20}{3}\] [from Eq.(i)]


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