Question

A wire is formed into a circle having a diameter of 10.0 cm and placed in a uniform magnetic field of 3.00 mT. The wire carries a current of 5.00 A. Find
a. the maximum torque on the wire, and
b. the range of potential energies of the wire-field system for different orientations of the circle.

Answer 1

`tau_(max)=MB=IAB=lpir^2B=5xxpixx(0.05)^2xx3xx10^-3`
`=375pixx10^-7Nm`
`U_(max)=+MB, U_(min)=-MB`