The question asks us to identify which of the options is not explained by the law of gravitation. Let's analyze each option:

1. The electrostatic attraction between two charged bodies: The law of gravitation is concerned with the force of attraction between masses due to gravity. The electrostatic force, however, is the force between charged particles, governed by Coulomb's law. Hence, this option does not relate to gravitational forces. This is the correct answer.
2. Tides in oceans: The gravitational pull of the moon and, to some extent, the sun, on the Earth causes tides. This phenomenon is explained by the law of gravitation.
3. Artificial satellites revolving around the Earth: Satellites orbit Earth due to the gravitational force acting as the centripetal force required for circular motion. Thus, they are explained by the law of gravitation.
4. Falling of raindrops to the Earth: Objects, including raindrops, fall to the Earth primarily due to Earth's gravitational pull. This is a direct application of gravitational theory.

Hence, the option "The electrostatic attraction between two charged bodies" is not explained by the law of gravitation, as it deals with electromagnetic forces, not gravitational forces.