Question
From what it can be said that the electric charge on any object is always an integral multiple of 'e' ?
✓
Answer
►If the protons and electrons are the only basic charges in the universe, all the observable charges have to be integral multiples of $e$.
►Thus, if a body contains $n_1$ electrons and $n_2$ protons, the total amount of charge on the body is $n_2 \times e+n_1 \times(-e)=\left(n_2-n_1\right) e$. Since $n_1$ and $n_2$ are integers, their difference is also an integer.
►Thus the charge on any body is always an integral multiple of $e$ and can be increased or decreased in steps of e.
►Thus, if a body contains $n_1$ electrons and $n_2$ protons, the total amount of charge on the body is $n_2 \times e+n_1 \times(-e)=\left(n_2-n_1\right) e$. Since $n_1$ and $n_2$ are integers, their difference is also an integer.
►Thus the charge on any body is always an integral multiple of $e$ and can be increased or decreased in steps of e.
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