Error in EK physics question? (E&M)

[KungFuPanda123]

#81 in the 9th edition Physics EK (30 minute exams)

States:
How much work is done to move a point charge (q) a distance of x at an angle of 30 degrees to the line of force of an electric field (E)?
A. qEx
B. qEx sin(30)
C. qEx cos(30)
D. Zero

Answer: B

My answer: C
Aren't we looking for the component of the charge's movement that is moving parallel to the electric field lines? Isn't that found by taking cos(30)? I thought that taking sin(30) would give us the component that is PERPENDICULAR.

Any help is appreciated!

---

Members don't see this ad.

 

[sazerac]

When you can find errors like this in your review texts, you are very close to being ready for MCAT.

 

[Yo Sup]

Came on here to ask the same question

 

[balopathic45]

I literally thought I was going insane - I spent 15 minutes drawing vectors and ****, rethinking my entire life. Thank you