A small sphere with a charge of 2.40 is attached to a relaxed horizontal spring whose force constant is 90.0 . The spring extends along the axis, and the sphere rests on a frictionless surface with its center at the origin. A point charge is now moved slowly from infinity to a point on the axis. This causes the small sphere to move to the position .

Question

A small sphere with a charge of 2.40 is attached to a relaxed horizontal spring whose force constant is 90.0 . The spring extends along the  axis, and the sphere rests on a frictionless surface with its center at the origin. A point charge  is now moved slowly from infinity to a point  on the  axis. This causes the small sphere to move to the position .