The charges of electrons and protons are identical in magnitude but opposite in sign. Furthermore, all charged objects in nature are integral multiples of this basic quantity of charge, meaning that all charges are made of combinations of a basic unit of charge. Usually, charges are formed by combinations of electrons and protons. The magnitude of this basic charge is
∣qe∣=1.60×10−19C.
The symbol q
is commonly used for charge and the subscript e
indicates the charge of a single electron (or proton).
The SI unit of charge is the coulomb (C). The number of protons needed to make a charge of 1.00 C is
1.00 C×1proton1.60×10−19C=6.25×1018protons.
Similarly, 6.25×1018
electrons have a combined charge of −1.00 coulomb. Just as there is a smallest bit of an element (an atom), there is a smallest bit of charge. There is no directly observed charge smaller than ∣qe∣, and all observed charges are integral multiples of ∣qe∣.
The charges of electrons and protons are identical in magnitude but opposite in sign. Furthermore, all charged objects in nature are integral multiples of this basic quantity of charge, meaning that all charges are made of combinations of a basic unit of charge. Usually, charges are formed by combinations of electrons and protons. The magnitude of this basic charge is
∣qe∣=1.60×10−19C.
The symbol q
is commonly used for charge and the subscript e
indicates the charge of a single electron (or proton).
The SI unit of charge is the coulomb (C). The number of protons needed to make a charge of 1.00 C is
1.00 C×1proton1.60×10−19C=6.25×1018protons.
Similarly, 6.25×1018
electrons have a combined charge of −1.00 coulomb. Just as there is a smallest bit of an element (an atom), there is a smallest bit of charge. There is no directly observed charge smaller than ∣qe∣, and all observed charges are integral multiples of ∣qe∣.
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