Need help with torque on a rectangular coil

AI Thread Summary
The discussion revolves around calculating torque on a rectangular coil, with a focus on using geometric principles to determine the radius. The original poster struggled with the problem for an extended period before seeking assistance. A response clarified that the radius could be derived from geometric considerations rather than other methods. Ultimately, the original poster expressed gratitude for the help received and confirmed they found the answer to their question. The conversation highlights the importance of geometric understanding in solving physics problems related to torque.
Sanosuke Sagara
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This is another question that I have think for very long hours but still find the solution to this question.I have my question in the attachment that followed.
 

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No. Not that way. You can calculate r using purely geometry.
 
Thanks for your help and I finally get the answer to my question.
 
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