First charge q_{1}= 20 x 10^{-6}

Second charge q_{2}= 80 x 10^{-6}

Distance d =10cm

**Let the electric field will be zero at point O.**

Two point charges 20 micro coulomb and 80 micro coulomb are 10 cm apart at point A and B.

The distance between O and A is (10-x) cm and the distance between O and B is x cm.

Since,

**Hence, The electric field will be zero at 6.67 cm distance from 80 micro coulomb.**