A-Determine the magnitude of the electric field E⃗ at the origin 0 in the figure(Figure 1) due to the two charges at A and B.
Express your answer in terms of the variables Q, l, k, and appropriate constants.

B-Determine the direction of the electric field E⃗ at the origin 0 in the figure due to the two charges at A and B.

C-Repeat A, but let the charge at B be reversed in sign.

D-Repeat B, but let the charge at B be reversed in sign.

http://session.masteringphysics.com/problemAsset/1083975/3/GIANCOLI.ch21.p38.jpg

I know B and D are angles. I tried 60 degrees for B and 30 degrees for C, but it says my answers are wrong

Question

A-Determine the magnitude of the electric field E⃗  at the origin 0 in the figure(Figure 1) due to the two charges at A and B.
Express your answer in terms of the variables Q, l, k, and appropriate constants.

B-Determine the direction of the electric field E⃗  at the origin 0 in the figure due to the two charges at A and B.

C-Repeat A, but let the charge at B be reversed in sign.

D-Repeat B, but let the charge at B be reversed in sign.

http://session.masteringphysics.com/problemAsset/1083975/3/GIANCOLI.ch21.p38.jpg

I know B and D are angles. I tried 60 degrees for B and 30 degrees for C, but it says my answers are wrong

anonymous · Answer

What is k ?

anonymous · Answer

I'm not sure how it wants me to represent my answer in Q,l, and k

anonymous · Answer

If you know the expression for the field due to a point charge, and you can add vectors, then the problem is quite straightforward, but i have no idea what the question means by 'k'

anonymous · Answer

hmm ok. I'm not entirely sure what equation it wants

anonymous · Answer

do you know coulomb's law ?

anonymous · Answer

yes