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The question which I was wondering about was that how does a positive charged particle know that the other particle is positively or negatively charged? Then I thought that maybe there is some difference in the electric field which is used as an identification.so pls answer

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    $\begingroup$ Visualizations of electric field lines have a direction. They point from positive to negative. So a positive charge has all lines pointing away from it and a negative charge has all lines pointing towards it. Just like magnets. $\endgroup$ – DKNguyen May 28 at 5:30
  • $\begingroup$ does the questioner have any doubt about magnets? If not, what is the problem here? If yes, read about magnets $\endgroup$ – Sidarth May 28 at 10:10
  • $\begingroup$ Can u explain that $\endgroup$ – THE LEARNER Jun 2 at 8:15
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By definition following the experimental facts, a charged particle creates a field (whatever it is) that gets into the equation of motion of the other charges and vice versa. This feature gives the true meaning to the particle field concept.

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An electron and a proton , assumed as classical charged particles, are attracted to each other ,and the field of the electron has the opposite sign to the proton, as all charges studied for a few centuries. Here is the classical picture.

posnegcharge

This image is true to the mathematics describing the interaction as long as the extended mass of the charge is not neared. Then the type of mass etc will play a role in the near dimensions to the charges.

This image is more true for an electron and a proton, as an electron is an elementary particle with zero dimensions in the standard model of particle physics, whereas the proton is composed of charged quarks and has dimensions of order fermi.

The differences though between protons and electrons are not used for the definitions of positive and negative charge. That is an experimental observation, and when electrons and protons were discovered, the electrons by convention were assigned a negative sign and the protons the positive.

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