E & M Qual Problems

1.) A rigid, infinitesimally thin conducting ring of radius [math]\displaystyle{ a=0.15 m }[/math] and mass [math]\displaystyle{ m=1.0kg }[/math] is initially oriented nearly vertically in a uniform vertical magnetic field [math]\displaystyle{ \vec{B} = B_0 \hat{z} }[/math].