The gravitational potential due to earth at infinite distance from it is zero. Let the gravitational potential at a point P be -5 J kg-1. Suppose, we arbitrarily assume the gravitational potential at infinity to be +10 J kg-1, then the gravitational potential at P will be

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−51 kg−1

+5J kg−1

−151kg−1

+15J kg−1

answer is B.

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Detailed Solution

According to the problem, as the potential at ∞ increases by +10 J kg-1, hence potential will increase by the same amount everywhere (potential gradient will remain constant). Hence, potential at point P = 10 - 5 = + 5J kg-1

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