Magnetic force on a circuit

1. The problem statement, all variables and given/known data

(Ans: A,B,C,D)

2. Relevant equations

3. The attempt at a solution
The magnitude of force on the structure is given by

$$|I(\vec{AC}\times \vec{B})|=I|\vec{AC}||\vec{B}|\sin(\pi/4)$$
From the question, ##I=2\,A##, ##|\vec{AC}|=2\sqrt{2}\,m## and ##|\vec{B}|=2\,T##. Hence,
$$|F|=2\times 2\sqrt{2}\times 2 \times \frac{1}{\sqrt{2}}=8\,N$$
However, this is incorrect as per the answer key.

Any help is appreciated. Thanks!

Attached Images
File Type: png magnetic force.png (105.3 KB)

http://ift.tt/1hnToFf

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