The plane inside the wire loop is parallel to the direction of the homogeneous magnetic field as presented in the picture below. The wire loop can freely rotate around its axis. A current of 3.7 A runs through the wire. There's a 4.5g weight hung to the loop. How great does the magnetic flux density have to be for the loop to be in balance?

Question

The plane inside the wire loop is parallel to the direction of the homogeneous magnetic field as presented in the picture below. The wire loop can  freely rotate around its axis. A current of 3.7 A runs through the wire. There's a 4.5g weight hung to the loop. How great does the magnetic flux density have to be for the loop to be in balance?

anonymous · Answer

sorry about the file size. will work on it.

anonymous · Answer

you need to equate the torque provided by the magnetic field

anonymous · Answer

of course. i need someone to process the magnetic field's torque for me. i'm a bit shaky on that.

anonymous · Answer

attachment

anonymous · Answer

$$E = -\frac{d(\phi)}{dt}$$ ...you're feed back factor

anonymous · Answer

$$\tau(magentic moment of the loop) \times B = torque$$

anonymous · Answer

I'd really appreciate it if someone could do the work and give me an example how to solve these problems.

anonymous · Answer

3.04 approx and assuming that the B field will be perpendicular.