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April 21, 2014

Homework Help: Physics

Posted by Peace on Tuesday, January 29, 2008 at 9:04pm.

Two point charges, Q1 = -6.7 C and Q2 = 1.2 C are located between two oppositely charged parallel plates. The two charges are separated by a distance of x = 0.32 m. Assume that the electric field produced by the charged plates is uniform and equal to E = 75000 N/C. Calculate the net electrostatic force on Q1 and give its direction.

My solution:

ForceQ1 = Force P + Force Q2

Fp = EQ1
FQ2 =kQ1Q2/ x^2

= (75000 x -6.7 x 10^-6) + [9x10^9 x -6.7 C x 1.2 C]/ 0.32^2

FQ1 = 0.20N

but webassign says i'm wrong. Can someone help?

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