Which of the following statements is/are INCORRECT?
1
The value of G on the moon is equal to that on the earth.
2
26.68 × 10-11 N is the force of gravitation between two point masses of 2 kg and 2 kg kept 1 m apart.
3
Newton's law of gravitation is valid in the laboratory only.
4
Force is inversely proportional to the square of the distance between two bodies.