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- Homework Statement
- DISCLAIMER: the statement is translated by me from Italian, and it contains a few terms which I found tricky to translate into English; forgive me in advance for any inaccuracy :)

A squared coil(##l=0.11m##) has 40 windings and traveled by a current ##I=20mA##.

##\rightarrow##Calculate the torque applied on the coil by a magnetic field ##|\vec{B}|=2.5e-2 T## lying on the plane of the coil.

- Relevant Equations
- $$\vec{\tau}=NI\vec{A}\times\vec{B}$$

Okay, so, the magnetic field lying(parallel) to the plane of the coil is confusing me quite a bit.

Usually, in this kind of problem, we have a magnetic field directed perpendicularly to the plane.

Considering this orientation of the field, wouldn't the torque on this sort of "elementary brush motor" be equal to ##0##(since the cross product of two parallel vectors is so)?

I think the problem is really badly formulated since it doesn't specify the center nor axis of rotation of the objects... it just speaks of "torque" without really putting it into context.

Usually, in this kind of problem, we have a magnetic field directed perpendicularly to the plane.

Considering this orientation of the field, wouldn't the torque on this sort of "elementary brush motor" be equal to ##0##(since the cross product of two parallel vectors is so)?

I think the problem is really badly formulated since it doesn't specify the center nor axis of rotation of the objects... it just speaks of "torque" without really putting it into context.