Ok i got the hard parts, a and b. For some reason I'm stuck on part c, the direction of the electric field.
Consider point a which is 70 cm north of a -4.2 µC point charge, and point b which is 76 cm west of the charge.
(a) Determine Vba = Vb - Va.
1Your answer is correct. V
(b) Determine Eb - Ea (note this is a vector minus a vector).
2Your answer is correct. N/C
3Your answer is incorrect.° (counterclockwise from east is positive)
The Attempt at a Solution
I tried all the combinations of inverse tangent to try to get theta. Came up with 42.647 47.353 132.647 and 137.353...all wrong. What am I missing? Any good help is appreciated.