VIT Engineering VIT Engineering Solved Paper-2014

  • question_answer
    If  \[{{\text{ }\!\!\Delta\!\!\text{ }}_{\text{r}}}\text{=}\left| \begin{matrix}    \text{2r-1} & ^{\text{m}}{{\text{C}}_{\text{r}}} & \text{1}  \\    {{\text{m}}^{\text{2}}}\text{-1} & {{\text{2}}^{\text{m}}} & \text{m+1}  \\    \text{si}{{\text{n}}^{\text{2}}}\left( {{\text{m}}^{\text{2}}} \right) & \text{si}{{\text{n}}^{\text{2}}}\left( \text{m} \right) & \text{si}{{\text{n}}^{\text{2}}}\left( \text{m+1} \right)  \\ \end{matrix} \right|\text{,}\] then value of \[\sum\limits_{r=0}^{m}{{{\Delta }_{r}}}\] is

    A) 1                                             

    B)  0

    C)  2                                            

    D) None of these

    Correct Answer: B

    Solution :

    \[\delta ={{\tan }^{-1}}\left( \frac{2}{\sqrt{3}} \right)\] \[R=\frac{\Delta V}{\Delta l}=\frac{2.3-0.3}{10\times {{10}^{-3}}}\] \[R=\frac{2}{10\times {{10}^{3}}}\]              \[R=0.2\times {{10}^{3}}\Omega \]                  = 0              ( \[R=0.2\times {{10}^{3}}\Omega \] two rows are identical)


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