F = k*Q1*Q2/r^2
Q1 = Q , Q2 = Q ,
r = 24 m = 0.24m
So, F = 9*10^9*Q^2/0.24^2 = 17*10^-3
So, Q = 3.3*10^-7 C
So, the number of elecrtons transferred = Q/e = 3.3*10^-7/(1.6*10^-19)
= 2.06*10^12
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