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yjk91
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Homework Statement
Charge q1 = 1.8 10-8 C is placed at the origin. Charges q2 = -1.7 10-8 C and q3 = 2.6 10-8 C are placed at points (0.18 m, 0 m) and (0 m, 0.24 m), respectively, as shown in the figure. Determine the net electrostatic force (magnitude and direction) on charge
q3.
question attacted with picture
find the magnitude and direction
The Attempt at a Solution
F(2-3) = k*abs(q2 * q3) / l2 = 4.42*10-5 N
F(2-3)x = 4.42*10-5 N * cos (36.9)
F(2-3)y =4.42*10-5 N * sin(36.9)
F(1-3)y = k*abs(q1 * q3) / l2 = 7.3 * 10-5 N
and then you add each x and y and get the net magnitude
but answer to the angle seems to be 54.9 degrees not 36.9 why is it 54.9?
tan-1(.18/.24 ) = 36.9 degrees not 54.9 nor is 90-36.9 not= 54.9
thank you
it would help me a lot if someone wrote a walkthrough of this problem