NEET Sample Paper NEET Sample Test Paper-32

  • question_answer Three equal mass (m) are placed at vertex of an equilateral triangle of side r. work required to double the separation between masses will be:                  

    A)  \[\frac{G{{m}^{2}}}{r}\]

    B)  \[\frac{3G{{m}^{2}}}{r}\]

    C)  \[\frac{3}{2}\frac{G{{m}^{2}}}{r}\]

    D)  None

    Correct Answer: C

    Solution :

    work done = change in Gravitational potential Energy \[W={{U}_{F}}-{{U}_{I}}\] \[=3\left( \frac{-G{{m}^{2}}}{2r} \right)-\left( \frac{-3G{{m}^{2}}}{r} \right)\] \[=\frac{3}{2}\frac{G{{m}^{2}}}{r}\]

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