Newman static torque

Nowis

Newman static torque
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Hello all,

I have a question about the book of Joseph Newman on page 28.

On this page in section "III Static Measurements" the topic goes about the static torque that is generated by a 600 pound magnet at various voltages.

I don't understand how a coil can generate a static torque ?

I would like that someone could explain me this topic and also the formula's.
I am very interested in this topic and I want to replicate these tests myself.

Thanks in advance !