Torque: M=dM IBR'sin"ada=IBR2 The work done by the torque A=∫Mao=p.Bsino=p8 πR 1 Pm =I A=xRIB 2 2 2 0 2 2 2 1 M dM IBR sin  d  IBR       Torque: The work done by the torque A  Md  pm B d  pm B   2 0 sin     2 2 R p I m   A R IB2 2 1  