Which of these best arranges the planets in the solar system in the increasing order of their number of moons?
mars → neptune → uranus → saturn
uranus → jupiter → neptune → saturn
mars → venus → uranus → jupiter
earth → saturn → mars → jupiter

Mars → Neptune → Uranus → Saturn  

Explanation:

The solar system has 8 planets. The 4 outer gaseous planets have many moons as compared to 4 inner rocky planets.

Mercury and Venus have no moons

Earth has 1 one moon

Mars has 2 moons -Phobos and Deimos

Jupiter has 67 moons

Saturn has 62 moons

Uranus has 27 moons

Neptune has 14 moons

Thus, from the given options, the correct order of number of moons is:

Mars (2) → Neptune (14) → Uranus (27) → Saturn  (62)

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electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.