Figure shows a lamina in x-y plane. Two axes z and z’ pass perpendicular to its plane. A force F acts in the plane of lamina at point P as shown. Which of the following statements is incorrect?
(The point P is closer to 
-axis than the z- axis).
caused by F about z axis is along 
caused by F about z’ axis is along – 
Text Solution
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The directions of 
is given by right handed screw rule.
According to this rule, the directions of 
caused by 
about z axis is along 
Hence, options is correct.
Again, according to this rule, the directions of 
caused by 
about z axis is along 
Hence ,option is correct.
As 
and P is closer z` axis, therefore 
caused by 
about z axis is greater in magnitude than that about z` axis.
Hence option is also correct.
It is meaningless to add torques about two different axes.
Hence, options is incorrect.
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