Although electron(a moving object) obeys coloumb's law neverthless coloumb's law is astatic law. plz explain

At any instant dt the electron is at distance "r" from the nucleus and obeys colulombs law that that instant according to value of "r", other things being constant. This force called electrostatic force provides the force of attraction to electron to stay in orbital, or it will fly away due to its kinetic energy. Coulombs law applies to charges, no matter if they are moving or static, relative to each other. GRAVITY still applies to free fall.