I only need help in question 3 please Extra information the

I only need  help   in question # 3 please. (Extra information) the answer for #1 is b and for #2 is C.

Delta Consider a pair of charged particles Q and Q2-Q , placed on the y-axis as shown in the Figure below. Q= 0.100 C Note that the Figure also shows a point P, which is also located on the y-axis, at y -3.00 cm =+Q 1. The electric field created by charge at the point P has a magnitude of a. 150 x 10 N/C. b. 250x 10 N/C. C. 2.50x 10\' N/C. d. 112x10 N/C. e. 148 x 10 N/C 2. The electric field created by charge2 at the point PI has magnitude equal to a. 3.00x 10 N/C. b. 3.00x10 N/C. c. 999 x 10 N/C. d. 9.99 x 10 N/C. e. 9.99 x 10\' N/C 3. The total electric field at the point P has magnitude equal to a. 1.25 x 10s N/C. b. 1.03 x 10s N/C. c. 7.49x 10 N/C. d. zero. e. 749 x 103 N/C. 4. The total electric field at the point P is directed 4. b. in the ty direction. c. in the +x direction e. Since the total field is equal to zero, it has no direction. a. in the -y direction. d. in the -x direction. F10 F11 F9 F8 5 8

Solution

3)

Enet = kQ/(0.03)^2 - k*Q/0.06^2

= 9*10^9*0.1*10^-6*(1/0.03^2 - 1/0.06^2)

= 7.49*10^5 N/C <------- option e