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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 z'-axis than the z-axis). .

Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/torque-1422441" style="font-weight:bold;" target="_blank" title="Click to know more about TORQUE">TORQUE</a>`tau` causedby F aboutz- axisis along`-hatk`<br/>Torque `tau` caused by F aboutz'-axisis along`-hatk`<br/>Torque `tau` caused by F about z-axisis greater in magnitde to theplanecontainingr and F.<br/> totaltorqueis givenbe `tau = tau + tau'`</p>Solution :(A) Considertheadjacentdiagramwhere <a href="https://interviewquestions.tuteehub.com/tag/rgtr-2249609" style="font-weight:bold;" target="_blank" title="Click to know more about RGTR">RGTR</a> <br/>Torque`tau`aboutz-axis`tau=rxxf` whichis along `hatk`<br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/ARH_NEET_EXE_PHY_XI_C06_S01_012_S01.png" width="80%"/><br/> (B)`tau'=r'xxF` whichis along `-hatk` <br/> (c )`|tau|_(z)=Fr_(bot )=` magnitudeoftorqueaboutz- axiswhere `r_(bot)` is perpendiculardistancebetweenF and z-axis. <br/> SImolarly,`|tau|_(z)'=Fr_(bot)'` <br/> Clearly `r_(bot)gtr_(bot)'implies|tau|_(zgt) |tau|_(z)'` <br/>(d)we are alwayscalculatingresltant torqueabouta commonaxis .<br/> <a href="https://interviewquestions.tuteehub.com/tag/hence-484344" style="font-weight:bold;" target="_blank" title="Click to know more about HENCE">HENCE</a>, totaltorque `tau <a href="https://interviewquestions.tuteehub.com/tag/ne-1112263" style="font-weight:bold;" target="_blank" title="Click to know more about NE">NE</a> tau+tau'` because `tau and tau` arenotaboutcommon axis.</body></html>


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