I have learnt just about the right hand rule in vector cross product. How is this proved? Can anybody give an example where the cross product plays an important role and where the vector cross product formula is obeyed? Our professor just told us that the torque due to a force acting on a body is towards us if it is rotating anti-clockwise and away from us if it is rotating clockwise. I just looked up at the fan in the classroom. It was rotating anticlockwise. I wonder whether the wind produced is due to the torque of the force that is being applied by the motor on the leaves. So the wind should be upward if the fan rotates clockwise. I sense some mistake. But I am not able to frame out.