since it is attractive force , the charges would be opposite in nature
so q2 would be a negative charge
F = kq1q2 / r^2
where k = 9*10^9
q1 , q2 are the charges
r = seperation between the charges
5 = 9*10^9*3.7*10^-6*q2 / 0.21^2
q2 = 6.62*10^-6 C
= -6.62 uC
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