Force
F3=a2kq1q3=a29×109×13.1×10−9×q
F2=a2kq1q2=a29×109×13.1×10−9×q Net force
Fnet=2F2
F1=a2kq1q2=2a29×109×6.53×10−9×q
Fnet′=2a2kq1q2=2×a29×109×6.53×10−9×13.1×10−9
Fnet=(2×6.53+21×q×10−9)×13.1×10−18 Fnet=0
(2×6.53×10−9+21×q)=0
q=−18.46×10−9C
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