In a frame rotating at Larmor frequency, BO disappears. An RF pulse with strength Bl at Larmor frequency in the lab frame will appear to be a static magnetic field in this rotating frame. In the rotating frame, how will the bulk magnetization (MO) along 2 react to such a Bl field? What is the angular velocity of the rotation? If the Bl field is 25 kHz applied on xaxis, how long will it take to rotate bulk magnetization MO into the xyplane? After the 90 degree pulse with the xphase, MO will be along which axis? What is Bl field of 25 kHz in Tesla