I was going through the capacitor lesson in my textbook. In it its written "...both positive and negative plates will produce electric field in the same direction, hence the electric field adds up....outside the plates, electric field is zero since the field due to negative and positive charges are in opposite direction..." My doubt : i am confused at the 2nd statement. (i have attached two images) which electric fields are in opposite direction? how does it cancel out? Is this true only if the charge on the capacitor plates are same? Do electric fields extend to infinity? does the electric field outside capacitor for second image become zero?