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Lets assume the charges are q1 and q2 and both are equal to q.
d = 7.2 cm = 0.072m
E = 41N/C
But E = E1 + E2
E = kq/d^2
1.3889×10^13 × q = 41
Therefore q = 41÷ 1.3889×10^13 = 2.952×10^-12 C
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