How Do You Calculate Torque on a Triangular Loop in a Magnetic Field?

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bibo_dvd
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hello guys
iam doing my homework in magnetic fields course
and i found this problem i solved (a) and (b)

by using F=I L x B and the total force on the triangular loop would be zero
but in (c) i tried a lot to find the torque on the loop but i couldn't get the same result
so please help me with this :)
Thx guys :)

Textbook problem D9.5 on a conducting triangular loop through points A(3,1,1), B(5,4,2), C(1,2,4) with magnetic field B = 0.2a_x - 0.1a_y + 0.3a_z T, followed by printed answers to parts (a) through (d).
 
bibo_dvd said:
hello guys
iam doing my homework in magnetic fields course
and i found this problem i solved (a) and (b)

by using F=I L x B and the total force on the triangular loop would be zero
but in (c) i tried a lot to find the torque on the loop but i couldn't get the same result
so please help me with this :)
Thx guys :)
Show what you tried. How do you determine the torque on a current carrying loop?