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JEE Main & Advanced Physics Gravitation / गुरुत्वाकर्षण Question Bank Gravitation Potential

  • question_answer
    If mass of earth is M, radius is R and gravitational constant is G, then work done to take 1 kg mass from earth surface to infinity will be                           [RPET 1997]

    A)             \[\sqrt{\frac{GM}{2R}}\]      

    B)             \[\frac{GM}{R}\]

    C)             \[\sqrt{\frac{2GM}{R}}\]

    D)               \[\frac{GM}{2R}\]

    Correct Answer: B

    Solution :

                    Potential energy of the 1 kg mass which is placed at the earth surface = \[-\frac{GM}{R}\] its potential energy at infinite = 0 Work done = change in potential energy = \[\frac{GM}{R}\]


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