Question

The point at which the gravitational potential and the gravitational field due to earth is zero is at

• A. earths surface
• B. a height $R_e$ from earths surface ( $R_e$ = radius of earth)
• C. a point below the earths surface
• D. infinity

Answer 1

Answer: (D)

Gravitational potential, $V=-\frac{GM}{r}$ and intensity of gravitational field, $I=\frac{GM}{r^2}$ If $V=0$ and $I=0,$ Then, $r=\infty$ (infinity) So, the point at which the value of both gravitational potential and gravitational field is zero is at infinity.