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Homework Help
Introductory Physics Homework Help
Magnitude and direction of Electric field
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[QUOTE="vanitymdl, post: 4653438, member: 411408"] [h2]Homework Statement [/h2] 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 [h2]Homework Equations[/h2] [h2]The Attempt at a Solution[/h2] 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 [/QUOTE]
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Introductory Physics Homework Help
Magnitude and direction of Electric field
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