${\text{F}}_{\text{g}},{\text{F}}_{\text{e}}$ and Fn represents the gravitational, electrostatic, and nuclear forces respectively between two electrons, then arrange them in increasing order of their strengths.

${\text{F}}_{\text{g}}<{\text{F}}_{\text{e}}<{\text{F}}_{\text{N}}$ 

Gravitational force is the weakest and long-distance force. It exists between all the objects having some mass but is significant enough only when highly massive objects are involved like planets, moon, stars, etc.

Electrostatic force exists between the charged objects and is stronger than the gravitation force. It is the cause of the lightening when negative charges from the clouds are attracted towards the positive charge developed on the ground.

The nuclear force is the strongest force and it exists between the particles present inside the nucleus. It is a very strong force as it overcomes the electrostatic repulsion between protons present in the nucleus and keeps it intact.