Question

A system consists of 55 electrons and 43 protons. (a) Is the total charge of the system positive or negative? Explain. (b) What is the total charge of the system?

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(a)\textbf{(a)} Electrons have a negative charge and protons have a positive charge but both have the same magnitude of charge. Since the system contains a greater number of electrons than protons, the total charge of the system must be negativenegative,

(b)\textbf{(b)} The charge of electron is e-e and the charge of proton is +e+e, so the total charge of the system is

55(e)+43(e)=12e=12(1.6×1019  C)=1.9×1018  C.55(-e) + 43(e) = -12e = -12(1.6\times10^{-19}\;\mathrm{C}) = -1.9\times10^{-18}\;\mathrm{C}.

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