electric field in absence of q2
E = k q1 / d^2
E = k* q1 / d^2
a)
Considering q2 to be positive
2 E = k ( q1/ d^2 + q2 / (2d)^2 )
2* k q1 / d^2 = k ( q1 / d^2 + q2 / 4d^2)
q1 / d^2 = = q2 / 4 d^2
q2 = 4 q1
q2 = 0.8 uC
========
b)
Considering q2 to be negative
2 k q1 / d^2 = k ( q2 / (2d)^2 - q1 / d^2)
3 q1 / d^2 = q2 / 4 d^2
q2 = 12 q1
q2 = 2.4 u C
========
Comment in case any doubt, will reply for sure. Goodluck
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