At the simplest level they do so because when charges were first contemplated, it was part of their descrpition/definition that this was so. Just as the origninal convention has an electron negative, not positive - the rule is entirely arbitary - making them positive would have very major repurcussions, but it would not ultimately make any difference to the understanding of science. On a higher level, you are in the realms of sub-atomic physics, some of it in highly esoteric realms of thinking.
another perspective: There is no "why" in science only "how". But that is possibly even more esoteric!!
Electromagnetism.
because the magnets have the same electric charges so they repel from each other so north attracts 2 south and south repels from south & north repels from north.
Charges create an electric field around them. This electric field creates a force that attracts or repels other charges. The field attracts opposite charges or repels same charges. The force F= q1q2 zc/2r2 .
A proton attracts an neutron. B. A proton repels an electron. C. A proton attracts an electron.
Magnetic, only attracts or repels metals electric charge can attract or repel nonmetals and metals
Yes; positive attracts negative, or vice versa. There is also electrostatic induction: if something is charged and is moved near another object, it repels or attracts electrons (only), giving it opposite charges, so attracts each other. The object which is electrostatically induced is overall neutral, however, it is unbalanced withe negative electrons pulled to one side, leaving the opposite side positive.
Gravity!
Charges create an electric field around them. This electric field creates a force that attracts or repels other charges. The field attracts opposite charges or repels same charges. The force F= q1q2 zc/2r2 .
The gravitational force is only attractive. Electric and magnetic forces can be both attractive and repulsive.
magnetic pole
Gravity.
a magnets attracts repels objects