Question

# 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

A
5Jkg1
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B
+5Jkg1
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C
15Jkg1
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D
+15Jkg1
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Solution

## The correct option is C +5Jkg−1According to the problem as the potential at ∞ increases by +10 J kg−1, hence potential will increases by the same amount everywhere (potential gradient will remain constant). Hence, potential point P=10−5=+5 J kg−1

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