Two Ions Are Placed on the X-Axis

Two ions are placed on the x-axis.One has a charge of +e and is located at the origin.The other has a charge of -4e and is located at x = +d,where d > 0.Where on the x-axis could a third charge be placed such that the net electrostatic force on it caused by the other two charges is zero?

A) x = -2d
B) x = -d
C) x = +d
D) x = +2d

Correct Answer:

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