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e = - 1,6×10^-19 C
me = 9,1×10^-31 kg
q = - 60×10-6 C
n = __?
∆m = __?
banyak elektron
n = q / e
n = 60×10-6 / 1,6×10^-19
n = 3,75×10^14 buah elektron ←
tambahkan massa
∆m = n me
∆m = 3,75×10^14 • 9,1×10^-31
∆m = 6×10^-5 kg ←