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NEET Sample Paper NEET Sample Test Paper-77

  • question_answer
    If two electrical devices, whose resistances are in the ratio of \[1: 2\] and connected in series, the power dissipated in them has the ratio of                                                                                   

    A)  \[1:1\]                          

    B)  \[1:4\]

    C)  \[2:1\]              

    D)  \[1:2\]

    Correct Answer: D

    Solution :

    In series combination, power dissipated, \[\Rightarrow \,\,\,\,P\propto {{l}^{2}}R\] \[\Rightarrow \,\,\,\,\,P\propto R\,\,\,\,\,or\,\,\,\,\,\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{{{R}_{1}}}{{{R}_{2}}}\] Here      \[{{R}_{1}}:{{R}_{2}}=1\,\,:\,\,2\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{1}{2}\,\,\,\,\Rightarrow \,\,\,{{P}_{1}}:{{P}_{2}}\,\,=1\,\,:\,\,2\]


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