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NEET Sample Paper NEET Sample Test Paper-44

  • question_answer
    At what height from the surf ace of earth the gravitational potential and the value of g are\[-5.4\times 1{{0}^{7}}\,J/k{{g}^{2}}\,\,and\,\,6m/{{s}^{2}}\]respectively take the radius of earth as 6400 km:

    A) 2600 km

    B)                           1600 km

    C) 1400 km           

    D) 2000 km

    Correct Answer: A

    Solution :

    Linear magnification \[\operatorname{m}=\frac{I}{O}=\frac{\operatorname{f}}{\operatorname{f}-u}~\Rightarrow m=\frac{-10}{15}=\frac{-2}{3}\] \[\operatorname{Axial} magnification = {{m}^{2}} = \frac{4}{9}\] \[\operatorname{Area} of image = \frac{4}{9} area of object\] \[= \frac{4}{9}\times {{\left( 3 \right)}^{2}}=4{{\operatorname{cm}}^{2}}\]


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