Solving a problem in physics section 60 paragraph 93 el

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93. A square and circular contours have the same perimeter l = 10 cm, and it is the same current I = 3,0 A. The contours are placed in a uniform magnetic field with induction B = 0.20 T, and each contour plane makes an angle alpha = 45 ° to the direction of the field. Determine torques uV and Mcr acting on each of the circuits.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)