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

Options

A. `-5Jkg^(-1)`
B. `+5Jkg^(-1)`
C. `-15Jkg^(-1)`
D. `+15Jkg^(-1)`

Answer

B

Explanation

According to the problem as the potential at `oo` 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=+5Jkg^(-1)`