Why there is attraction between protons and neutrons when there is no charge attraction brtween the two?
Really its nice question!! Now you have to understand that attraction means action of force. In nature whenever you will fell any force then it will be one of the four fundamental forces. 1. Electromagnetic = Due to charge interaction = attractive and repulsive both 2. Gravitation = Due to mass effect = only attractive 3. Strong force or nuclear force = Due to fundamental particle effect ( protons and neutrons ) =Attractive 4. weak nuclear force = between light sub atomic particles like neutrino, anti neutrino So attraction between protons and neutrons are due to strong nuclear force, this attraction is not due to charge. In universe only charge is not the factor by which force will be originated. Strong nuclear force originates due to identity of protons and neutrons. This identity is enough to existance of this force.
