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A force ˆ ˆ F 4 i 10 j   acts on a body at a point having position vector ˆ ˆ 5 i 3 j   relative to origin of co-ordinates on the axis of rotation . The torque acting on the body is :

1. 38 ˆ k
2.  25 ˆ k
3. 62 ˆ k
4. none of these

Correct answer: 62 ˆ k

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