Physics Questions: Will award you ten points!?

Charge q2 experiences no net electric force. What is q1?

Answer 1

q1——qm——q2

Fnet on q2 = k*q2q1/0.2^2 + k*q2gm/0.1^2 =0

q2q1/0.2^2 = – q2qm/0.1^2

q1 = – 4*gm = 8.0 nC

check:
Fnet = k*q2* ( q1/0.2^2 + gm/0.1^2) =0
Fnet = k*q2* (8*10^-9)/0.2^2+(-2*10^-9)/0.1^2 = 0
OR:
Net E = 0 N/c at q2

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