A charged particle of \(40-\mathrm{nC}\) is located at the origin of the coordinate system. A second charged particle of \(50 \mathrm{nC}\) is located at \((x, y)=(0,2 m)\) and another charged particle of \(50 \mathrm{nC}\) is located at \((\mathrm{x}, \mathrm{y})=(2 \mathrm{~m}, 2 \mathrm{~m})\). Find the magnitude and direction of the electric force exerted by the first charged particle 

(a) on the second charged particle, 

(b) on the third charged particle.