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A slab is subjected to two forces 1 F G and 2 F G of same magnitude F as shown in the figure. Force 2 F G is in XY- plane while force 1 F G acts along z=axis at the point ( ) j 3 i 2 G G + . The moment of these forces about point O will be : 1 F G y 30° 6m O z x 4m 2 F G

1. ) k ˆ 3 j ˆ 2 i ˆ 3 ( − − F
2. F ) k ˆ 3 j ˆ 2 i ˆ 3 ( − +
3. F ) k ˆ 3 j ˆ 2 i ˆ 3 ( + +
4. F ) k ˆ 3 j ˆ 2 i ˆ 3 ( + −

Correct answer: F ) k ˆ 3 j ˆ 2 i ˆ 3 ( + −

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