Direction of Torque and Angular Momentum
In figure (a), the torque is perpendicular to the plane formed by r and F and is the direction your right thumb would point to if you curled your fingers in the direction of F. Figure (b) shows that the direction of the torque is the same as that of the angular momentum it produces.
Source
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"OpenStax College, College Physics. November 17, 2012."
http://cnx.org/content/m42184/latest/?collection=col11406/1.7
OpenStax CNX
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