Solution,
1)
Electric field, E = k q1 q2/r
Since charges are equal, so they will cancel each other.
Electric field, E = 0 N/C
2)
Electric field, E = k (q1 + q2) /r^2
E = (9 x 10^9) (5.78 + 5.78) x 10^-6/(4.46/2)^2
Electric field, E = 20892.5 N/C
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