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vanitymdl
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Homework Statement
Calculate the magnitude of the electric field E = (-11i^+14j^)N/C
∣∣E⃗ ∣∣ = _______ N/C
Calculate the direction (relative to the +x-axis ) of the electric field E = (-11i^+14j^)N/C.
θ =_________∘ counterclockwise from the +x-axis
Homework Equations
The Attempt at a Solution
So magnitude would be SQRT(-11^2 + 14^2) = SQRT(317) = 17.8 N/C
For direction you'd take the inverse tan so:
theta = ATAN(14/-11) = -51.8 degrees
But that means the angle is 51.8 degrees BELOW the x-axis, so counter-clockwise it'd be
360-51.8 = 308.2 degrees
BUT I'm getting this part wrong and I don't know why? what am I doing wrong