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has a charge of 1.5 × 10−9 C, are located at

y = +0.50 m and y = −0.50 m.

The Coulomb constant is 8.98755 ×

10^9 N · m2/C2.

a) Find the magnitude of the resultant elec-

trical force on a charge of 1.0×10−9 C located

at x = 0.55 m.

Answer in units of N.

So I drew out a force diagram and thought that the equation would be:

Fel=kc(Q1*q/d1^2)+kc(Q2*q/d2^2) where the q is the 1.0e-9C charge.

Fel=(8.98755e9)(1.5e-9*1.0e-9/.0025)+(8.98755e9)(1.5e-9*1.0e-9/1.1025)

so Fel=5.404757e-6

Apparently that was the wrong answer. Does anybody know or want to explain how I should now re-examine the problem?