A \(+10 \mathrm{nC}\) charge is located at \((x, y)=(0 \mathrm{~cm}, 10 \mathrm{~cm})\) and a \(-5.0 \mathrm{nC}\) charge is located at \((x, y)=(5.0 \mathrm{~cm}, 0 \mathrm{~cm})\). Where would a \(-10 \mathrm{nC}\) charge need to be located in order that the electric field at the origin be zero?