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NEET Sample Paper NEET Sample Test Paper-41

  • question_answer
    A resistor R has power dissipation P with cell voltage E. The resistor is cut in n equal parts and all parts are connected in parallel with same cell. The new power dissipation is:

    A) nP                               

    B) \[{{\operatorname{nP}}^{2}}\]

    C) \[{{\operatorname{n}}^{2}}P\]                        

    D) \[\operatorname{n}/P\]

    Correct Answer: C

    Solution :

    Resistance of each part =R/n Effective resistance \[=\frac{R}{{{n}^{2}}}\] Battery voltage is constant \[\operatorname{P}\propto \frac{1}{R}\Rightarrow \frac{P'}{P}=\frac{R}{R/{{n}^{2}}}={{n}^{2}}\]


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