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A positive electric charge, e.g. a proton (red) and a negative charge, e.g. an electron (blue) exert an electric force on each other which is either repulsive or attractive. The force is different depending on the distance \( r \) of the two charges.
Equal charges (e.g. in the picture two positive charges) repel each other and their electric field lines (gray) point away from each other to infinity. Charges with different sings (e.g. a positive and a negative charge in the picture) attract each other and their field lines end on the other charge.