given
Q = 7.2 micro C
E = 77000 N/c
let d is the distance where net electric field is zero.
Apply, E = k*Q/d^2
d^2 = E/(k*Q)
d = sqrt(E/(k*Q))
= sqrt(77000/(9*10^9*7.2*10^-6))
= 1.09 m
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