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## Homework Statement

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.

http://www.webassign.net/giancoli5/17_23alt.gif <------FIGURE

(a) Determine Vba = Vb - Va.

1Your answer is correct. V

(b) Determine Eb - Ea (note this is a vector minus a vector).

Magnitude

2Your answer is correct. N/C

Direction

3Your answer is incorrect.° (counterclockwise from east is positive)

## Homework Equations

## 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.

--aweg