physics

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PLEASE HELP!! I HAVE A TEST TOMORROW!!

i just posted this problem but a very important drawing was left out!

if Q=30 uC, q=5.0 uC, and d=30cm, what is the magnitude of the electrostatic force on q in N?

(Ke= 8.99 x 10^9 Nm^2/C^2)
(uC= micro coulombs)
(u= 10^-6)

d 2d
O<--->O<--------->O
Q q 2Q


a. 15
b. 23
c. zero
d. 7.5
e 38

i know coulomb's law but i don't know how to apply it to this problem

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