2*3.14*R=31.4-->R=5cm圆环磁矩pm=IS=1.5*3.14*5^2=0.011775A*m^2当圆环平面和磁感线夹角为60°时匀强磁场中,圆环所受的磁力距M=pm*B*sin30(或sin150)=2.355*10^(-6)Nm
