- #1

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