The gravitational potential due to earth at infinite distance from it is zero. Let the gravitational potential at a point P be −5Jkg−1. Suppose, we arbitrarily assume the gravitational potential at infinity to be +10Jkg−1, then the gravitational potential at P will be
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a
−5Jkg−1
b
+5Jkg−1
c
−15Jkg−1
d
+15Jkg−1
answer is B.
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Detailed Solution
According to the problem, as the potential at ∞ increases by +10Jkg−1, hence potential will increase by the same amount everywhere (potential gradient will remain constant). Hence, potential at point PP=10−5=+5Jkg−1