- #1
victorializ
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Homework Statement
Two point charges, Q1 = -4.0 μC and Q2 = +3.0 μC, are placed as shown. In Figure 17.14b, the x-component of the electric field, at the origin O, is closest to:
A) -3000 N/C
B) 3800 N/C
C) 9800 N/C
D) -3800 N/C
E) -9800 N/C
Homework Equations
kq/r^2
The Attempt at a Solution
i understand how to get the magnitude of both forces of Q1 and Q2 by using kq/r^2
i found the hypotenuse to use as the length which is 2.57m .
what I'm lost on is the direction vectors that i need multiply the forces by.
in relation to Q2 i have found the inverse tangent and the angle comes out to be about 33. but when i multiply it by the force i get and get the difference with the force of Q1 it's not right.
any help is much appreciated, this one problem has been giving me trouble for quite some time!