Fundamental Forces: Force of one charged particle on another

[JoeyBob]

Homework Statement

See attached

Relevant Equations

F=9E9qq/r^2

So first I did the vector stuff.

r2-r1= 1.3 i hat-47.5 j hat-14.5 k hat

magnitude = 49.68

magnitude squared = 2468.19

Now plugging it all in...

F=9E9*6.3E-3*2.8E-3/2468.19=64.322

y vector, -47.5/49.68=-0.956119 j hat

Multiply this by force and I get -61.499 but answer should be -36.14

 

[haruspex]

Homework Statement:: See attached
Relevant Equations:: F=9E9qq/r^2

r2-r1= 1.3 i hat-47.5 j hat-14.5 k hat

Check the k component.

 

[JoeyBob]

Check the k component.

Thanks. The werid thing is that this I did this question a month ago and made the same exact mistake (my wrong answer is the same as the new wrong answer I just got).