<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field . There are two types of electric charges: positive and negative (commonly carried by protons and electrons respectively). Like charges repel and unlike attract . An object with an absence of net charge is referred to as neutral . The SI derived unit of electric charge is the coulomb (C). In electrical engineering, it is also common to use the ampere - hour (Ah), and, in chemistry, it is common to use the elementary charge (e) as a unit . The symbol Q often denotes charge . Early knowledge of how charged substances interact is now called classical electrodynamics, and is still accurate for problems that don't require consideration of quantum effects . </P> <P> Electric charge is a conserved property; the net charge of an isolated system, the amount of positive charge minus the amount of negative charge, cannot change . Electric charge is carried by subatomic particles . In ordinary matter, negative charge is carried by electrons, and positive charge is carried by the protons in the nuclei of atoms . If there are more electrons than protons in a piece of matter, it will have a negative charge, if there are less it will have a positive charge, and if there are equal numbers it will be neutral . Charge is quantized; it comes in integer multiples of individual small units called the elementary charge, e, about 6981160200000000000 ♠ 1.602 × 10 coulombs, which is the smallest charge which can exist free (particles called quarks have smaller charges, multiples of 1 / 3e but they are only found in combination). The proton has a charge of + e, and the electron has a charge of − e . </P> <P> Electric charges create an electric field, if they are moving they also generate a magnetic field . The combination of the electric and magnetic field is called the electromagnetic field, and its interaction with charges is the source of the electromagnetic force, which is one of the four fundamental forces in physics . The study of charged particles, and how their interactions are mediated by photons, is called quantum electrodynamics . </P>

What kind of charge does an object that has an excess of electrons have