A point charge –1 nC is placed at the origin. A uniform electric field of 900 N C⁻¹ acts along +y. At what distance from the origin, measured along the +y-axis, will the net electric field be zero?
(Take k = 9 × 10⁹ N m² C⁻².)
a) 0.01 m above the origin
b) 0.10 m below the origin
c) 0.10 m above the origin
d) No point on the y-axis gives zero field