(solution) Two point charges, -10 nC and +18 nC , are held fixed a

(solution) Two point charges, -10 nC and +18 nC , are held fixed a

Two point charges, ?10 nC and +18 nC , are held fixed a distance 0.50 m apart. Assume that both charges lie on x-axis, for the -10 nC x = 0 and for the +18 nC charge x = 0.50 m .

Express your answer to two significant figures and include the appropriate units.

A) Where can a +20 nC charge be placed so that the net force on it is zero?

B) Repeat part A if the third charge is ?20 nC.