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A point charge q1=4.20 nC is fixed at the origin. A second point charge q2=−7.80 nC...

A point charge q1=4.20 nC is fixed at the origin. A second point charge q2=−7.80 nC is fixed at the point x=15.0 cm.

(a) Find the point on the +x axis where the electric potential is zero.

(b) A third charge, q3=−2.30 nC is then placed at the point x=20.0 cm. Find the net force acting on charge q2 due to the other two charges.

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