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NTSE Sample Paper NTSE SAT Practice Test-16

  • question_answer
    For a given voltage V, if resistance is changed from R to\[\left( \frac{R}{n} \right)\], then the power consumed changes from P to

    A) nP         

    B) \[{{n}^{2}}P\]

    C) \[\frac{P}{n}\]                          

    D) \[\frac{P}{{{n}^{2}}}\]

    Correct Answer: A

    Solution :

    [a] \[P=\frac{{{V}^{2}}}{{{R}^{'}}}\] when \[{{R}^{'}}=\frac{R}{n},\] then \[{{P}^{'}}=\frac{{{V}^{2}}}{(R/n)}\] \[=n\left( \frac{{{V}^{2}}}{R} \right)\] = np                


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