Magnetism

[trail lintel]

How to find torque using coupling forces, not M x B...
My couple force concept isn't that clear, i want this question to clear it for me...

[warm pecan]

<@&1227987967939838003>

Note for OP

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[trail lintel]

Couple forces will be : i(dl x B) force acting on the circle

Like this, the cos45 components create torque

But the ans isn't the same as using M x B when i do it...

[acoustic blade]

You cant just simply use i(L×B)

Every dl element is at different angle with B

Try for theta = 0 first

Try to calculate force using calculus on both half rings

[trail lintel]

Oh i see

[trail lintel]

Alr thanks I'll try that

+solved @acoustic blade