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CMC Medical CMC-Medical VELLORE Solved Paper-2012

  • question_answer
    The point at which the gravitational potential and the gravitational field due to earth is zero is at

    A)  earths surface

    B)  a height \[{{R}_{e}}\] from earths surface (\[{{R}_{e}}\] = radius of earth)

    C)  a point below the earths surface

    D)  infinity

    Correct Answer: D

    Solution :

                    Gravitational potential, \[V=-\frac{GM}{r}\] and intensity of gravitational field, \[I=\frac{GM}{{{r}^{2}}}\] If \[V=0\] and \[I=0,\] Then, \[r=\infty \] (infinity) So, the point at which the value of both gravitational potential and gravitational field is zero is at infinity.


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