Authenticated and Verified Answer from latest Electromagnetic literature:
Firstly , from Coulomb's Law we know that : F= kq1. q2/r^2
For the field developed by charge q=q1 at a distance r,
E = kq / r2
Now, simply substitute the valuesof k,r and E.
2.7 N/C = ( 9 x 109 x q ) / ( 0.542 )
q = 8.75 x 10-11 C
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