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Which of the following amounts of charge cannot exist freely?

(a) 4.8 * 10^-18 C (b) 6.4 * 10^-16 C
(c)9.6 *10^-20 C (d) -3.2 *10^-14 C
(e)16 *10^-20 C
(given charge of an electron = -1.6 * 10^-19)



According to the principle of quantisation of charge, only the pure integral multiple of electronic charge can exist freely
so (c)9.6×10⁻²⁰ C cannot exist freely
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