The highlighter is the answer. But I don't know why. Please solve and explain it to me. Thank you so much.

5. Two point charges, Q1 = +2.0 JC and Q2 =-3.0 JC, are placed as shown in the figure. What is the y- y component of the electric field at the origin O? Q1 4.0 m a) +0.21x10' N/C b) +0.29x103 N/C O c) -1.4x103 N/C X d) -1.1x10' N/C 3.0 m 4.0 m Q2 6. An electric dipole consists of two charges @1 = - 4.0 uC and Q2 = +4.0 uC separated by 0.0010 m in the y-direction and centered on the origin. What is the y-component of the electric field at the point x = 0, y = -0.50 m? Q1 O +560 N/C X age -1200 N/C +290 N/C d) -580 N/C Q2 10. An electric dipole consists of two charges @1= -100 MC and Q2 = +100 uC separated by 0.01 m in the y-direction (upward) and centered on the origin. There is an external electric field of 100 N/C in the +x-direction. What is the Q1 torque on the dipole? a) 0.001 N in the +z-direction O b) 0.001 N in the -z-direction X c) 0.0001 N in the +z-direction d) 0.0001 N in the -z-direction Q2